04-20-2013, 06:53 AM
Even if they are water worlds - and I presume there is some basis for that assertion, such as Sol-like elemental abundances in the parent star so that the planets wouldn't be carbon-rich worlds with an ocean of crude oil instead of water - that still doesn't mean they would be suitable for Earthly life. One possibility, for example, is that they would have life but with a radically different genetic code and/or different proteins. AFAIK, Earth life's DNA and RNA bases are far from being the only purines and pyrimidines possible - and there are a heck of a lot more amino acids than the limited set Earth life uses. And, of course, there is the issue of chirality.
On top of that, we have no proof at all that a water-based form of life with COMPLETELY different chemistry isn't possible.
On top of that, we have no proof at all that a water-based form of life with COMPLETELY different chemistry isn't possible.