Asteroid shower rained space rocks on Earth and the moon 800 million years ago

Jan 4, 2020
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It's hard to tell if the timing (or phosphorous) is correlated with what happened on Earth, and there were several (possibly global) ice ages at the time which likely mean you would have to have a prolonged shower - their binning is by necessity coarse.

Mostly, we have had these proposals of spikes in the impact record before, like the "late heavy bombardment", which later have been problematical to square with added data.
 
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Jul 10, 2020
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Why would Bennu and Ryugu date to 800 million years ago? That would mean they were created at the same time as the shower was happening which doesn't make sense. You would think all these asteroids would have been around for a while before they showered the Earth and the Moon. If anything, one would expect a date much older than 800 million years.
 
Apr 7, 2020
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Why would Bennu and Ryugu date to 800 million years ago? That would mean they were created at the same time as the shower was happening which doesn't make sense. You would think all these asteroids would have been around for a while before they showered the Earth and the Moon. If anything, one would expect a date much older than 800 million years.
Hi! The article says they were born 830 million years ago which would have given them 30 million years to hit us or the moon.
 
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Jul 10, 2020
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Hi! The article says they were born 830 million years ago which would have given them 30 million years to hit us or the moon.
That's so strange though. All that debris was basically what formed our planets, and must have come from the gas cloud that our Sun was originally from. It seems they should have been much older than 30-million years before impact. Unless, of course, they were created by an impact in our own solar system, but it seems they would have to be completely molten at that time in order to get the age reading the get now.
 

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