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_kst_ t1_ixs4j9a wrote
Reply to comment by enderjaca in NASA’s Orion Sends Back New Views of Moon’s Surface by Maxcactus
A quick Google search found this article which says:
> Typically, though, a meteoroid would have to be about the size of a marble for a portion of it to reach the Earth's surface. Smaller particles burn up in the atmosphere about 50 to 75 miles (80 to 120 kilometers) above the Earth.
A crater is typically about 10 times the diameter of the meteorite that created it.
Any crater that's big enough to be visible from space would have formed either on the Moon or Earth.
Unless (and I neglected to allow for this) it hits in the ocean.
According to this article, the smallest meteorite crater on Earth is about 7cm in diameter and 3cm deep. That wouldn't be visible from space.
_kst_ t1_ixrvmiq wrote
Reply to comment by Ralphie99 in NASA’s Orion Sends Back New Views of Moon’s Surface by Maxcactus
i don't think Earth's atmosphere significantly reduces the number of craters that are formed on Earth. Anything big enough to form a crater that's visible from space is going to get through the atmosphere reasonably intact.
Earth has fewer visible craters than the Moon because it erases them.
_kst_ t1_ixs4tng wrote
Reply to comment by Ralphie99 in NASA’s Orion Sends Back New Views of Moon’s Surface by Maxcactus
The smaller craters yes -- but only the ones that are so small that they can't be from orbit. See my other comment.