Our ability to discover planets is very new to astronomy as is
  the search for signs of ET life via new planet discoveries.*

  I think our criteria for "life" is very limited at the moment.
  Anthropomorphic bias: Things called "living" seem to all have at
  least SOME parallels to us humans.

  So yes, I think we're missing a lot.   Agreed. I think we need
  some advances in bridges between chemistry and biology. There's
  some speculative work done. For as long as I know there's always
  been a subset of scientists who believe that some forms of
  crystals may actually be living.

  The borderline of life/non-life is a fascinating field.

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