Late Heavy Bombardment
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The Late Heavy Bombardment, or lunar cataclysm, is a hypothesized astronomical event thought to have occurred approximately 4.1 to 3.8 billion years ago, at a time corresponding to the Neohadean and E
Artist's impression of the Moon during the Late Heavy Bombardment (above) and today (below)
Full Moon 2010
Pingualuit aerial 2007
Oldest dated rocks
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The oldest dated rocks formed on Earth, as an aggregate of minerals that have not been subsequently broken down by erosion or melted, are more than 4 billion years old, formed during the Hadean Eon of
A sample of gneiss from the site of the Earth's oldest dated rocks (the Acasta River area of Canada). This sample has been dated at 4.03 billion years old.
The Moon rock "Big Bertha", collected on the 1971 Apollo 14 mission, contains an Earth meteorite that is 4 billion years old.
Fragment of Acasta Gneiss