The Building Blocks for Life on Earth:

No, read Paddo's quoted passage of Abstract, in Post #1, about the volatile materials, which until then I had not even considered at all, but his post started the mutual analysis of known evidence.
My initial point was that Theia was big enough to deliver sufficient amounts of water to create our current oceans.
AFAIK, early Earth did not have a lot of water , if any at all.

p.p.s. From Post #16

https://en.wikipedia.org/wiki/Theia_(planet)

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Known objects in the Kuiper belt beyond the orbit of Neptune. (Scale in AU; epoch as of January 2015.)

https://en.wikipedia.org/wiki/Kuiper_belt

 

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Just ran across these two excellent videos on "Life Beyond" earth.

 

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