[r9etb]

I really, really doubt this hypothesis. It would require millions of comets to provide enough water.

[RightWhale]

If you could grap an ice comet and land it on the moon, you would have the missing ingredient to make lunar colonies possible. There wouldn't an immediate business application since just snagging the comet would cost $ billions and building the colony would be a lot more.

[satchmodog9]

that is the most innane thing i ever heard. Must be government funded researchers wasting time and money.

[Mike Darancette]

I really, really doubt this hypothesis. It would require millions of comets to provide enough water.

A million comets is 1 comet every 1000 years for a billion years.

[Alberta's Child]

I thought this hypothesis was idiotic, too. But I read a fascinating article a few years ago about it, and was surprised to see that what had been tossed aside decades ago as a silly theory was actually gaining renewed support because of some sort of breakthrough in astronomy that lent some serious credibility to it.

[null and void]

Genesis 7
11 In the six hundredth year of Noah's life, in the second month, the seventeenth day of the month, the same day were all the fountains of the great deep broken up, and the windows of heaven were opened.
12 And the rain was upon the earth forty days and forty nights.

[S0122017]

There is no size limit to a comet :)
A planet the size of jupiter can be a comet if it flies through space unbound by a star. Besides, millions of comes of a period of billions of years is not that much.