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The asteroid that hit Vredefort is estimated to have been one of the largest ever to strike Earth (at least since the Hadean eon some four billion years ago). The asteroid is thought to have been approximately 5–10 km (3.1–6.2 mi) in diameter. The bolide that created the Sudbury Basin could have been even larger. [3] The crater has a diameter of roughly 250–300 km (160–190 mi),[2] larger than the 200 km (120 mi) Sudbury Basin and the 170 km (110 mi) Chicxulub Crater. This makes Vredefort the largest known impact structure on Earth. The Vredefort Crater's age is estimated to be 2.023 billion years (± 4 million years),[1] which places it in the Paleoproterozoic era.
If the Wilkes Land Crater in Antarctica is an impact crater, then it is the largest known at 500 km (310 mi) in diameter.
Originally posted by Myomistress
reply to post by pacifier2012
What was your exact point upon replying in this thread if you honestly had nothing to add to the topic and obviously did not enjoy reading it? Just move on with your life, we don't need your unimpressed dialogue here.
Anyway, I kind of like the theory above. That these were just lifeforms on Earth at the time of the strike that after being shipped out into the vacuum of space became... Freeze dried for a better term and this is what's left. It would be quite interesting to actually explore the moon further for more things like this. If this were true, it could give us a whole lot more information about the history of our planet.
Originally posted by charlyv
. There would be no food source for any bacteria or single/ simple unicellular life for that matter, no atmospheric oxygen, no liquid water, nothing that could sustain any form of life as we know it.
edit on 8-11-2012 by charlyv because: spelling where caughtedit on 8-11-2012 by charlyv because: (no reason given)edit on 8-11-2012 by charlyv because: spelling where caught
Originally posted by kdog1982
Can anyone download this pdf on session notes from this conference?
I can not.
Wednesday Morning, 8:30 a.m. Room A Refractory Inclusions sess39.pdf
Room B Gardening on the Moon: Regolith Processes and Characterization sess40.pdf
Room C Mars: Troughs, Tectonics, and Teslas sess41.pdf
Room D Stardust: Collected, Remote, and Captured sess42.pdf
www.lpi.usra.edu...
ETA: Great thread btw and thank you for the link.
www.panspermia.org...edit on 8-11-2012 by kdog1982 because: (no reason given)
Originally posted by thedman
reply to post by charlyv
Problem is an impact large enough to launch an object on a lunar trajectory would have sufficent energy
to melt the rocks and sterilize them destoying all living organisms, if not completely carbonizing them......
Originally posted by Bilky
Originally posted by charlyv
. There would be no food source for any bacteria or single/ simple unicellular life for that matter, no atmospheric oxygen, no liquid water, nothing that could sustain any form of life as we know it.
edit on 8-11-2012 by charlyv because: spelling where caughtedit on 8-11-2012 by charlyv because: (no reason given)edit on 8-11-2012 by charlyv because: spelling where caught
There are bacteria that live kilometres below the ground and feed off of elemental sulphur with no atmospheric oxygen available and probably never was at that depth. geysers that boil have rare bacteria that can survive harsh extremes. I have no trouble contemplating bacteria on the moon. Btw water is present in a frozen state on the moon and also antarctica has its own bacterial species.edit on 9-11-2012 by Bilky because: (no reason given)
Originally posted by thedman
reply to post by charlyv
Problem is an impact large enough to launch an object on a lunar trajectory would have sufficent energy
to melt the rocks and sterilize them destoying all living organisms, if not completely carbonizing them......
Originally posted by JimOberg
Originally posted by thedman
reply to post by charlyv
Problem is an impact large enough to launch an object on a lunar trajectory would have sufficent energy
to melt the rocks and sterilize them destoying all living organisms, if not completely carbonizing them......
That used to be the argument against 'Mars meteorites', since they didn't look very 'shocked' at all.
Finally it was shown that glancing impacts on an atmosphered planet would create a 'spurt' of fluids ejected at more t6han escape velocity -- and small rock fragments could eaisly be entrained in the spurt and accelerated along with the fluids more 'gently' [hundreds of G's instead of millions of G's] than originally thought.
The problem isn't in departure, it's in arrival. Hitting an airless planet requires all the kinetic energy to be dispelled during 'litho-braking' -- hitting the ground. That creates deceleration forces more t6han ample to vaprozie small objects and shatter big ones.
No, it's now thought that an atmosphere at destination is also required for 'gentle' enough braking. And don't sweat the fireball -- it's only in the outer few millimeters of the object, the rest of it doesn't have time to heat up before slowing below incandescent spped.
Now, case in point, the Moon. It's thought possible that very early on, the moon did occasionally have a tenuous and temporary atmosphere from impacts of comets. A piece of earth-born blown-off debris arriving during such an interval, by chance, could quite easily have survived to the ground intact.