Peter Grindrodさんのイラストまとめ
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Research Leader in Planetary Science @NHM_London Northerner in London exile. Occasional cricket bat maker. he/him
petergrindrod.netフォロー数：510 フォロワー数：1944
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The rays of Tycho Crater are spectacular.
One travelled >2000 km and hit the side of a mountain.
Which caused a landslide on the other side.
Two astronauts sampled the landslide.
Labs on Earth got sample ages of 110 million years old.
And that is how we know the age of Tycho.
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