4 ms·

And Jack and Jill won't contaminate space when they're sent to start Earth 2?

• ben_w 6y ago
  By the time we’re ready to even try that, we should have already answered the question, at least as far as whichever target you’re trying to colonise is concerned. (And if you meant space itself, rather than the objects within, could reasonably be described as ‘contaminated’, then panspermia is both very likely how life got started on Earth and a reason to expect it everywhere else too).