Late Heavy Bombardment - 'The Late Heavy Bombardment (commonly referred to as the lunar cataclysm, or LHB) is a hypothetical event around 4.1 to 3.8 billion years ago. During this event an extraordinary number of the impact craters on the Moon would have formed, and by inference an extraordinary large number of impacts on Earth... Extrapolating lunar cratering rates to Earth: 22,000 craters with diameters >20 km, about 40 > 1,000 km, several > 5,000 km'
The Hadean, being an informal not stratigraphically defined eon, is here defined as the period from the Tellus (proto-Earth)-Theia impact (circa 4520 mya) to the end of the LHB (Late Heavy Bombardment) period,about 3800 bya. Recently, Goldblatt et al. 2010 have proposed an even earlier eon, the Chaotian,for events pertaining to the formation of the Solar System
Late Heavy Bombardment: construction in the destruction? Comet and asteroid barrage may have given Martian life a leg-up Where Earth nurtured life, Mars (as far as we know) has not. But a seemingly destructive event some four billion years ago may have given Martian life the boost it needed.
#Mars #Space – Mars Had Surprising 400-Million-Year Lull Between Giant-Impact Eras : Mars enjoyed about 400 million years of relative peace between two giant-impact epochs long ago, a new study suggests. Researchers determined that there were likely no gigantic impacts on the Red Planet between about 4.5 billion years ago and the “Late Heavy Bombardment” …