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## Journalcorbettw's Journal: help with math1

Hopefully somehow out there is better with math than I.

Suppose a giant ball of ice, 130km in diameter (water volume significantly greater than the Great Lakes) were to strike the moon at a speed of 3km/s (just above the moon's escape velocity). If my math is right, most of the water will remain on the moon in the newly formed crater, though I'm sure a significant amount would sublimate away over time.

Any help would be appreciated.

Oh, and this is for a possible scifi story. I just want to make sure the basis for the drama is at least plausible, it doesn't have to be 100% exact.
The question, how much water would end up left behind? I'm not sure if it would rival Lake Superior, Lake Erie, some other lake, or essentially none at all.

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## help with math

Comments Filter:
• #### 3Km/s? (Score:2)

Well that's 10,800 Km/hr, so my best guess is one big steam explosion and a new Tycho crater [wikipedia.org]. Maybe what you want isn't an impact at 3 Km/s but an impact at 3m/s like an ice ball that settles into an orbit a 100 m above the surface and hit an mountain or two and rolls along the ground . If memory serves me correctly, in a book titled "Somebody else is on the Moon" there were pictures of boulders on the moon that had rolled up hill; that kind of glancing blow would splatter ice and water over quite a bit of

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