Space... the final frontier...

Discussion in 'The Rabbit's Ears' started by Mr Stickyfingers, Apr 9, 2017.

  1. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...hey all... this thread's creation was fully inspired by kxk's thread called... http://www.behindbigbrother.com/forums/threads/stargazing-magic-tv.55022/ ... it enabled me to talk about things to do with Space/Astronomy and the wonders of the Universe itself for a first time really which is a very avid passion of mine... I'm always checking out the NASA website all of the time... as I said in kxk's post... I practically live on that website when not on here etc lol!... but there are many other websites to do with the Russian/Japanese/Chinese and European Space Agencies too...not to mention websites to do with Space Telescopes and anything to do with Space exploration...

    ...even if it's only kxk and myself that will admit to being the geeky spacenik types and we're the only two that ever use this thread then it was worth posting it up in my opinion... at least I now have somewhere to vent my Space nerdiness lol!...

    ...so!... if there is anywhere that people want to vent out their Space-alcoholism this is it... it can be about anything... Space research/Space exploration/Telescopes and their research/Space images from Hubble etc/Astronomy/upcoming future rocket launch times/Space missions/upcoming future shows such as the one the other night on the ABC/a place to share with each other Space websites that we frequent ourselves that others are unaware of etc/hell why not even Sci-fi TV series or movies to do with Space I don't care... as long as it has to do with all things about Space... this thread will either die an abysmal quick death or may struggle along with just kxk and myself posting alone... I don't care either way... at least it's somewhere for me (and perhaps kxk) to post all of this stuff to vent it out of our systems lol!...

    ...anyway... after prattling on about it... I'll leave you with these... we cannot possibly be the only signs of life in this Universe... we just can't be... and thanks for your thread kxk... it really was an inspiration to me... :thumbsup:;)... cheers.

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  2. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...just an example of what this thread is about... images and a video from NASA on cyclone Debbie... wow!... on this website link below... cheers.

    https://www.nasa.gov/feature/goddard/2017/91p-southern-pacific-ocean




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    This image of rainfall totals shows the heaviest rains appear in purple over the Coral Sea as Debbie approached landfall in Queensland, Australia. IMERG indicated that rainfall totals were greater than 500 mm (~ 20 inches) along many parts of Debbie's track. IMERG indicates that the most extreme rainfall fell along the coast where Debbie came ashore.
    Credits: NASA/JAXA, Hal Pierce
     
  3. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...I've just realised something... this thread should've probably been posted in 'The lounge' most likely when I think of it... if so... could someone in Admin (Brekkie or Marquisite?) move it over to there please?... if it's okay in here then that's fine too... sorry about that... on occasions I'm just a nerdy spacenik nuff nuff sometimes!... lol!... cheers.
     
  4. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...this has been mentioned elsewhere on these forums before I'm certain of it but I find this news sad to be honest... it's like losing an old friend to me... the Saturn probe 'Cassini' is soon to be ending it's days because it is running out of fuel... the NASA scientists have decided to send it out in grand style though and intend to send it to it's firey death by crashing it onto Saturn itself while broadcasting it's death throes back to Earth as it does it... wow!... what a way to go out in blazing glory eh?... on this website below...

    https://www.nasa.gov/mission_pages/cassini/main/index.html

    ...here is a great video of what to expect in the oncoming future... and and below some memorable shots taken by Cassini in the past... R.I.P Cassini... farewell old friend... cheers.



    http://news.nationalgeographic.com/...-titan-space-science-cassini-nasa/#/60498.jpg

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  5. kxk

    kxk JACK

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    Oooooo, I love @Mr Stickyfingers - what fantastic pics.
    Saturn is such a pretty planet.
    And what is that last white up close pic of?

    I just loved the whole stargazing experience, it helped me a lot at a time of family dis-function, we are so tiny and insignificant.
    The Universe is so enormous and stunning, and how much do we forget every day the wonder all around us.
    I want to visit a big observatory:)

    Great thread idea - and maybe I should start a thread for one of my geeky passions, Kind Arthur and everything to do with that, and medieval times. New film out soon looks great
     
  6. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...it's Saturn's moon 'Enceladus' kxk... on this website below is some really interesting things about it... my sweet darling wife and myself have visited the Jodrell Bank Observatory with the giant Lovell Telescope near Manchester in Encland about 30 years ago... it was so fascinating... we've also visited the Parkes Observatory in NSW a while back too... I was in Heaven when I visited both places believe me lol!... cheers.

    http://news.nationalgeographic.com/news/2014/04/140403-liquid-water-saturn-moon-enceladus-science/

    Saturn Moon Harbors Ocean, Raising Possibility of Life

    Scientists have found a large body of water beneath the surface of Enceladus.
    By Marc Kaufman, for National Geographic
    PUBLISHED April 4, 2014


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    An ocean detected on Saturn's moon Enceladus (above) lies between ice and rock about 25 to 30 miles (40 to 48 kilometers) below the surface.
    IMAGE COURTESY NASA/JPL/SPACE SCIENCE INSTITUTE

    A substantial ocean most likely exists beneath the icy surface of Saturn's diminutive moon Enceladus, raising the possibility that primitive forms of extraterrestrial life exist in its briny depths.


    The ocean lies between the moon's rocky core and a layer of thick ice, and is estimated to be about the size of Lake Superior. That's large for a moon that is only 310 miles (500 kilometers) in diameter and could fit within the borders of Arizona.

    In our solar system, the only other moon known to have similar contact between liquid water and rock is Jupiter's Europa. Both the rock and the water are considered to be essential for the chemistry that could, over eons, turn nonliving matter into living entities.

    "The main implication of our work is that there are potentially habitable environments in our solar system that are entirely unexpected," said Luciano Iess, an aerospace engineer at the Sapienza University of Rome and lead author on the study published Thursday in the journal Science.

    The surface temperature on Enceladus is -180 degrees Celsius (-292 degrees Fahrenheit), but enough heat is produced by tidal forces that flex and melt the ice to create liquid water below. That the ice is heated by the effects of Saturn's gravity—the source of those tidal forces—rather than by radiation from the sun, Iess said, reinforces the theory that even distant and frigid celestial bodies might be habitable.

    "This strong indication of a regional sea under the ice on Enceladus heightens our interest in Enceladus as a possible habitable world," said Carl Pilcher, former director of NASA's Astrobiology Institute.



    Mapping a Moon With Gravity

    Scientists were surprised in 2005 when images taken by the Cassini-Huygens mission revealed substantial jets of salty water were spitting out from the south pole of Enceladus. Later, close flybys produced dramatic photos of the geysers and the additional discovery of carbon-based, organic compounds being released from nearby darkened fissures called "tiger stripes."

    Those discoveries strongly suggested there was water below the surface, but imagery alone could not confirm the liquid's presence. The scientists had to use the Cassini spacecraft in a different way, in effect turning it into a divining rod. (See "Ten Best Pictures From NASA's Cassini Probe—Saturn, More.")

    During three flybys Cassini made of Enceladus between 2010 and 2012, scientists studied the moon's gravitational field in detail by measuring ever-so-slight shifts in the satellite's path. The gravitational field of a moon or planet subtly varies due to changes in the density and amount of land or liquid across its surface. The changes in that field can affect a spacecraft orbiting above.

    Cassini scientists used Earth-based radio telescopes from the Deep Space Network to measure those tiny gravity-induced changes in the satellite's path, and to then indirectly map facets of the moon below.

    Comparing those gravity measurements with the moon's topography allowed researchers to conclude that large amounts of liquid water were present well below the surface. Key to the research is the fact that liquid water is 7 percent more dense than ice, which means it produces a greater gravitational effect.

    "To get our data, we had to detect exquisitely small changes in motion with a pretty impressive precision," said co-author David Stevenson, a planetary scientist at the California Institute of Technology in Pasadena. "That was new, but the rest of the story of how to understand masses from our data is basically Newton's laws of motion."

    Stevenson said that while the team's understanding of the water on Enceladus remained "somewhat fuzzy," members were quite confident that a reservoir had been found about 25 to 30 miles (40 to 48 kilometers) below the surface. The ocean, or sea, is estimated to be in a layer about 6 miles (10 kilometers) from top to bottom, lying between ice and rock.

    The team was convinced that the water was present in the south polar region—where the geysers and tiger stripes are found. However, there was not enough data to determine whether it might spread farther around the globe, Stevenson said. The ocean under the surface ice of Europa, a much larger moon, has been determined to circle its globe.

    Good Place to Look for Life

    Although the gravitational data painted only a very rough picture of the composition of Enceladus, the findings go a long way toward explaining some of the surprising features of the tiny and frigid moon.

    In a teleconference Wednesday, several members of the team said it was increasingly plausible that the water vapor in Enceladus's geysers is coming from the subsurface ocean and up through what Stevenson called the moon's "plumbing," to the tiger stripe region on the surface.

    Jonathan Lunine, a planetary scientist and astrobiologist at Cornell University in Ithaca, New York, and another member of the Cassini team, said the organic material detected earlier in the plume and around the tiger stripes increases the possibility that some form of life exists, or once existed, on Enceladus.

    So too does the new finding that the moon's ocean sits on bedrock. "Like at the bottom of our oceans, liquid water would seep through the rock and pick up nutrients and get warmer," Lunine said. "This makes the interior of Enceladus an attractive potential place to look for life."

    Finding that life, though, wouldn't be possible with Cassini. The spacecraft's spectrometer initially detected the organic material on the moon. However, Lunine said, a far more powerful instrument would be needed to determine if complex organics and possibly life existed in the liquid water.

    Cassini has been in orbit around Saturn since 2004 and is expected to pass by Enceladus three more times before the planned end of its mission in 2017. The Cassini team hopes to navigate the spacecraft through the geyser plume during one of the flybys to get an intimate look at its composition.

    "More studies of the plume material, particularly a sample return," said Pilcher, "would help us understand if life might even exist on this small moon."
     
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  7. kxk

    kxk JACK

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    Looks like a spectacular and beautiful sculpture.
    Gogglebox final is high quality
     
  8. kxk

    kxk JACK

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    Oh look at this @Mr Stickyfingers

    What has NASA found? Mysterious briefing to reveal ocean world discovery that will 'inform the search for life beyond Earth'
    • The press briefing will be held at 14:00 ET (19:00 GMT) on Thursday
    • New findings come from both Cassini spacecraft and Hubble Space Telescope
    • NASA says it will 'will help inform future ocean world exploration'
    • Cassini’s mission will officially terminate on September 15, in a planned plunge


    NASA has called a press conference to 'discuss new results about ocean worlds.'

    The US space agency says the new findings come from both the agency’s Cassini spacecraft and the Hubble Space Telescope.

    'These new discoveries will help inform future ocean world exploration - including NASA’s upcoming Europa Clipper mission planned for launch in the 2020s - and the broader search for life beyond Earth,' NASA said.

    It will reveal the finding at 2pm on Thursday - but refused to give any more clues.

    upload_2017-4-11_12-49-2.png
    Jupiter's sixth-closest moon Europa is one of the most interesting bodies in our solar system when it comes to the hunt for extra terrestrial life.

    WHO WILL SPEAK AT THE ANNOUNCEMENT
    Thomas Zurbuchen, associate administrator, Science Mission Directorate at NASA Headquarters in Washington

    Jim Green, director, Planetary Science Division at NASA Headquarters

    Mary Voytek, astrobiology senior scientist at NASA Headquarters

    Linda Spilker, Cassini project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California

    Hunter Waite, Cassini Ion and Neutral Mass Spectrometer team lead at the Southwest Research Institute (SwRI) in San Antonio

    Chris Glein, Cassini INMS team associate at SwRI

    William Sparks, astronomer with the Space Telescope Science Institute in Baltimore



    The event, to be held at the James Webb Auditorium at NASA Headquarters in Washington, will include remote participation from experts across the country.



    The include several members of the Cassini team, raising speculation the announcement could be a revelation about Jupiter's sixth-closest moon Europa, ahead of the 2020 Europa Clipper mission, or Enceladus, the sixth-largest moon of Saturn.

    Jupiter's sixth-closest moon Europa is one of the most interesting bodies in our solar system when it comes to the hunt for alien life.

    The moon, which lies 500 million miles from the sun, has an ocean lying beneath its surface which makes it one of the most likely places in the solar system for life to thrive.


    Because Europa has the potential to have more liquid water than we have on Earth, some have speculated that the surprise reveal could be evidence for life.

    The 1,900-mile-wide (3,100 km) moon harbors a huge ocean of liquid water beneath its icy shell.

    Astronomers think this ocean is in contact with Europa's rocky mantle, making all sorts of interesting chemical reactions a possibility.

    Instead of direct evidence of life, however, experts have said it is more likely to be a step towards finding it.
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    This is an artist's concept of a plume of water vapour thought to be ejected off the frigid, icy surface of the Jovian moon Europa, about 500 million miles (800 million km) from the sun

    JUPITER'S ICY MOON
    Jupiter's icy moon Europa is slightly smaller than Earth's moon.

    Europa orbits Jupiter every 3.5 days and is tidally locked - just like Earth's Moon - so that the same side of Europa faces Jupiter at all times.

    It is thought to have an iron core, a rocky mantle and a surface ocean of salty water, like Earth.

    Unlike on Earth, however, this ocean is deep enough to cover the whole surface of Europa, and being far from the sun, the ocean surface is globally frozen over.

    Many experts believe the hidden ocean surrounding Europa, warmed by powerful tidal forces caused by Jupiter's gravity, may have conditions favourable for life.



    The announcement could be related to faint plumes of water spotted on the moon back in 2012.

    Hubble used a spectrograph to see normally invisible plumes of water vapour, shown in pictures as blue pixels above the moon.

    'By far the simplest explanation for this water vapour is that it erupted from plumes on the surface of Europa,' lead author Lorenz Roth of Southwest Research Institute in San Antonio said at the time.

    'If those plumes are connected with the subsurface water ocean we are confident exists under Europa's crust, then this means that future investigations can directly investigate the chemical makeup of Europa's potentially habitable environment without drilling through layers of ice.

    'And that is tremendously exciting.'

    Bill McKinnon, a planetary scientist at Washington University in St. Louis, told Business Insider the announcement is likely to be connected to these plumes.



    THE DEATH OF CASSINI
    Cassini’s mission will officially terminate on September 15, in a planned plunge.

    Since it left earth in 1997 and arrived at Saturn in 2004, Cassini has been touring the system with an up-close study of the planet, its rings and moons.

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    Twenty years after leaving Earth, NASA’s Cassini spacecraft is set to embark on the ‘thrilling final chapter’ of its life. The craft has circled Saturn for 13 years – but now, it’s running low on fuel

    During its journey, Cassini has made dramatic discoveries, including a global ocean within Enceladus and liquid methane seas on Titan.

    Before Nasa's Cassini probe captured the most detailed images of Saturn ever seen, it dropped its companion Huygens on the planet's largest moon, Titan.

    After nearly 20 years in space, the mission is drawing near its end because the spacecraft is running low on fuel.



    Read more: http://www.dailymail.co.uk/sciencet...l-new-results-ocean-worlds.html#ixzz4duDeOTKC
    Follow us: @MailOnline on Twitter | DailyMail on Facebook
     
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  9. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...thanks for posting about that upcoming conference kxk... it will be shown Live on NASA TV too (which I love to watch all the time lol!)... here is a link to it's schedule...

    https://www.nasa.gov/multimedia/nasatv/index.html#public

    ...and here is also a link to a great page on the NASA website about possible water (and perhaps life?) on other celestial bodies too...

    https://www.nasa.gov/specials/ocean-worlds/

    2017-04-12_11-03-43.jpg

    ...and yes... I'm geeky enough to stay up late that night to watch it Live too lol!... AND... for those people that don't know... this is a link to watching NASA TV Live just for good measure too... cheers.

    https://www.nasa.gov/multimedia/nasatv/index.html#public
     
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  10. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...speaking of your same post kxk... here is a Q & A conference on Cassini's planned plunge onto Saturn's surface... it's got the people that are directly involved in the project on the day... it's nearly an hour in length but speaking on behalf of myself only... I find it fascinating to watch... on this link below...

    https://www.nasa.gov/mission_pages/cassini/main/index.html

    ...and the video of the conference itself... cheers.

     
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  11. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...this post has been split into 2 parts because you can only put up so many videos in one post... so here is part 1...

    ...being that this thread is all about Saturn Saturn Saturn at the moment because of Cassini's impending doom I thought that I'd post some video tributes of what Cassini has actually achieved... this first one is of what NASA said back in 2014 of 'coming attractions' at the time... well it looks like all that they predicted back then came true plus plentiful more... this is what they promised at the time...



    ...this video is of the Huygen's probe as it landed on Titan... or as the publicity blurb on the video notes says...

    "It was October 15, 1997, when NASA's Cassini orbiter embarked on an epic, seven-year voyage to the Saturnian system. Hitching a ride was ESA's Huygens probe, destined for Saturn's largest moon, Titan. The final chapter of the interplanetary trek for Huygens began on 25 December 2004 when it deployed from the orbiter for a 21-day solo cruise toward the haze-shrouded moon. Plunging into Titan's atmosphere, on January 14 2005, the probe survived the hazardous 2 hour 27 minute descent to touch down safely on Titan’s frozen surface"



    ...and this video is of what the probe actually saw after image processing from NASA... all that I can say is... wow!...



    ...another of Saturn's moons... Enceladus... a great video of what they found...



    ...the next video is of the Hexagonal Hurricane on the northern pole of the Planet... it's absolutely intriguing to me... just amazing...



    ...that's the end of part 1... cheers.
     
  12. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...here is part 2...

    ...apparently a day on Saturn lasts no longer than 10 hours or so... Cassini stared at Saturn for around 40 odd hours and NASA produced a run down of what occurred in that time...



    ...and finally... a tribute to Cassini itself... what an amazing mission it has been... as I've stated before... I'm so going to miss the little fella but what a way to go eh?... anyway... enough of Saturn and Cassini from me until the actual demise of this wonderful spacecraft...



    ...for all stories of Saturn and Cassini on NASA's website click on this link below... cheers.

    https://www.nasa.gov/mission_pages/cassini/main/index.html
     
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  13. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...just a little bit of trivia... if you go to this website below you can make requests for free Space images of whatever you want to with the Space Telescope at the MicroObservatory Robotic Telescope Network at the Havard-Smithsonian Center for Astrophysics website on this link below...

    http://mo-www.cfa.harvard.edu/OWN/index.html

    ...this is what the main page looks like...

    2017-04-19_21-21-57.jpg

    ...all you do is go to the page and follow the links under 'control the telescope' and it will ask you what you want the photo of and what 'exposure' and 'length of seconds' for the image etc (it's so easy to do believe me) and the very next day they send you an email link to your image... it's as easy as that... the first day I asked for an image of the moon (they only do it on nights when the weather permits it of course) and this is what I got... I loved it!...

    Moon170410040558.GIF

    ...the next night I asked for a some images with a 1 second exposure shot of Jupiter and it's moons and also some with a 10 second exposure and this is what I got... I love it!... how cool is it to be able to do that?...

    Jupiter170411003127.GIF

    Jupiter170411043017.GIF

    ...to think that it's free to get these images is just brilliant... you do have to download a viewer if you want to tinker around with the images that you get for adding things like colour etc (which I did)... it's completely safe to do so... I've tinkered around with it for ages lol!... (but it's not necessary if you just want the images though)...

    ...in different parts of the website you can download other peoples requested images too if desired... when I clicked on the link for my image in the email this is the page that I got...

    2017-04-19_21-32-45.jpg
    ...when I clicked on 'information on this image' I was given all of this information... I understand very little of it I have to admit lol!...

    2017-04-19_21-35-20.jpg

    ...but just knowing that I can get all of that information makes me feel good regardless lol!... so yeah... if you can't afford your own Telescope well this is the next best thing lol!... by the way... all of the images are of the Northern Hemisphere only obviously being that it's in the USA lol!... another couple of good websites for images of Space/Space Telescopes etc are on these 2 links below... cheers.

    http://hubblesite.org/

    http://chandra.harvard.edu/
     
  14. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...Australia has sent up three Australian-made Satellites in the latest launch at Cape Canaveral at NASA in the USA... I was amazed to read that "One of the 1.3kg satellites is built from a 3D-printed material which has never been in space before"... wow!... the Satellite was 3D PRINTED?... what the hell?... lol!... bloody amazing!... and how clever too...

    ...I also like the sounds of this too... "Delta V boss Tim Parson said yesterday’s launch came at a key moment. “We’re hoping this year we’ll have an announcement to form an Australian space agency,” Dr Parsons said."... about time too I should think... from this link below... cheers

    http://www.theaustralian.com.au/new...e/news-story/521d927b263b92b9aedc2f62771b6ac3

    University teams send satellites into space
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    Elias Aboutanios of UNSW with one of the ‘CubeSats’’ launched in the US.

    12:00AM April 20, 2017

    The launch of three Australian satellites may be one small step in the worldwide space industry but it’s a giant leap for local universities and start-ups looking to the stars.

    At 1.11am (AEST) yesterday, a rocket blasted off from the Cape Canaveral launch pad in the US carrying 36 satellites, including the first Australian satellites to be sent into orbit in 15 years.

    Two of the Australian satellites were designed and built by teams from the University of Sydney and the University of NSW. The third was from the University of Adelaide and the University of South Australia.

    “Successful launch! The University of Sydney is in space! All perfect,” Sydney University space physics professor Iver Cairns said from Florida.

    It has taken the UNSW team about six years to get to launch day, according to the director of the Australian Centre for Space Engineering and Research, Andrew Dempster.

    “There is a lot of waiting but it’s actually quite satisfying now that the launch has actually happened,” Professor Dempster said.

    The satellites’ main mission is to monitor the thermosphere — a region between 200km and 380km above Earth — in collaboration with 50 universities.

    Also on board Australia’s small “CubeSats” is experimental technology invaluable for the UNSW team to see in action.

    One of the 1.3kg satellites is built from a 3D-printed material which has never been in space before. Also, a new computer chip will hopefully stop the satellite from crashing when hit by cosmic rays.

    Completing the project without an astronomical budget was a big achievement, said UNSW’s dean of engineering, Mark Hoffman. “We used to think of space as a place only big-budget space agencies could play in (but) the advent of cheap and powerful CubeSats has made space accessible,” he said.

    Sydney start-up supporter Delta V SpaceHub hopes to capitalise on this accessibility by helping companies develop space services such as 3D-printing solid rocket motors or developing new liquid fuels.

    Delta V boss Tim Parson said yesterday’s launch came at a key moment. “We’re hoping this year we’ll have an announcement to form an Australian space agency,” Dr Parsons said.
     
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  15. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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    ...if you hear a loud 'whooshing' noise go by and wonder what it was then it could be this lol!... I did have a big laugh at this comment though... "We are still undoing all the damage that 'Armageddon' did... Bruce Willis destroyed 10 years of science communication efforts in one poorly made movie... we're just not going to have a rogue asteroid that comes out of nowhere to destroy the Earth."... that really cracked me up lol!... from this website below... cheers.


    Kilometre-long asteroid 2014-JO25 - named 'The Rock' - to fly past Earth on Thursday

    Marcus Strom

    A huge asteroid travelling at 33 kilometres a second will sail past the Earth on Thursday morning, reminding us all that the universe is a very dynamic and potentially dangerous place.

    "This tells us how active space is - it's not static," said Brad Tucker, an astronomer at the Australian National University.


    Large asteroid to fly past Earth


    Kilometre-wide asteroid 2014-JO25 will sail past Earth on the morning of Thursday, April 20.

    "We are so used to hearing astronomers describing objects as light years away. Close encounters with asteroids are things that happen on a real timescale."

    Asteroid 2014-JO25 is a kilometre across and will come closer to the Earth than any asteroid of its size in 13 years.

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    An artist's impression of an asteroid near the Earth. Photo: Supplied
    However, it will sail safely past at 4.6 lunar distances - about 1.8 million kilometres away.

    Scientists in the US have nicknamed the asteroid "The Rock" either in honour of action hero Dwayne Johnson or after the Rock of Gibraltar, depending on who you ask.


    Professor Tim Bedding, head of the school of physics at the University of Sydney, said: "If an asteroid this size hit Earth, it would be catastrophic.

    "If it hit an ocean, the tsunamis it would raise could wipe out coastal cities. If it hit land, it would be a different scenario but in both cases completely catastrophic."


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    People look at what scientists believe to be a chunk of the Chelyabinsk meteor, which exploded over Russia in 2013. Photo: AP
    Dr Tucker said: "In the grand scheme of things, yes it is close because space is big. If it hit, its impact would be on the order of 10,000 megatons of TNT."

    But the asteroid poses no threat to Earth.
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    "The Rock", Dwayne Johnson.
    Dr Tucker said: "Our real worry is not something a kilometre long, that's easy to spot. We know where most of these are.

    "Something much smaller, such as the one that exploded over Chelyabinsk in Russia three years ago is more of a threat. That could come out of nowhere. That was about 10 or 20 metres - and that can cause enough damage if it hits the right place. Those, we know only a very few per cent."
    [​IMG]
    The Rock of Gibraltar. Photo: Getty Images
    Dr Tucker said: "We are still undoing all the damage that Armageddon did. Bruce Willis destroyed 10 years of science communication efforts in one poorly made movie.

    "We're just not going to have a rogue asteroid that comes out of nowhere to destroy the Earth."

    Professor Bedding said: "The most important thing is to detect big asteroids early so you can measure accurately their orbit. And if there is a chance they might intersect with Earth you have - hopefully - years or even decades to do something about it."

    Dr Tucker said: "Yes, we are going to have something that hits the Earth eventually. That is inevitable. But the planet has been around for 4.5 billion years and we only know of a few rare instances of very large impacts, so they are not common."

    [​IMG]
    Frequency of small asteroid impacts in the Earth's atmosphere, 1994-2013. NASA said 556 objects were destroyed in the Earth's atmosphere in that 20-year period. Photo: NASA/JPL

    NASA tracks asteroids as part of its Near Earth Object program. The object that poses the greatest impact threat to Earth is asteroid 29075, which is 1.3 kilometres long. NASA estimates it will come close to Earth on March 16, 2880. The probability of impact is one chance in 8300. This means there is a 99.988 per cent chance the asteroid will miss the Earth.

    Next month in Japan, NASA is holding a "Planetary Defence Exercise", simulating how agencies would react to the approach of an asteroid between 100 and 250 metres wide.

    The simulation will assume a possible impact 10 years later, in 2027.

    Dr Tucker said: "Every 100 million years or so you could expect one of these kilometre-sized asteroids to hit and release 10,000 megatons worth of energy - that's about half a million atom bombs the size of which destroyed Hiroshima in 1945."

    The asteroid that triggered the mass dinosaur extinction events 66 million years ago was 10 times the size of "The Rock".

    The robotic telescope service Slooh will be screening a live fly-by of the asteroid, which will be closest to the Earth at 9am on Thursday.

    Professor Bedding said: "There are few clever ideas about how to move asteroids if any become a serious threat to Earth. You could paint one side of an asteroid black so it heats up in a particular way and the solar heat causes it to move out of harm's way.

    "Breaking it up into pieces like in Armageddon won't help as the pieces all come and hit the Earth anyway."

    Other proposed methods do involve using nuclear weapons to deflect an asteroid's trajectory, or using lasers over time to push the object off a collision course, or pushing the object using ion thrusters or other engines.
     
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  16. Mr Stickyfingers

    Mr Stickyfingers an old fart that rants at times Awesome site donor

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  17. kxk

    kxk JACK

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    SOUTHERN LIGHTS.....
    Friday night lights
    Ben Domensino, Friday April 21, 2017 - 15:03 EST

    People in some of Australia's southern states could witness the Aurora Australis tonight.

    According to the Bureau of Meteorology, the dazzling Southern Lights may appear in the sky over Tasmania on Friday night and could also be visible in far southern Victoria.

    The phenomenon occurs when charged particles emitted by the sun reach Earth and interact with gases in our atmosphere.

    The colour of the display is determined by the gases involved in this process. Oxygen causes green and sometimes red (this is rare) and Nitrogen can produce blue or purple lights.

    Unfortunately, cloud cover may hinder the view tonight thanks to an upper level low pressure system moving over Victoria. The best chance of clear skies will be in southern Tasmania early in the evening away from anthropogenic light pollution.

    - Weatherzone
     
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