Exoplanet Biosignatures
Exoplanet Biosignatures: Observational Prospects talks about opportunities and methods for discovering hints of life in far-flung places, though it seems largely limited to "life as we know it."
Eh, give 'em time, they'll branch out. Right now the Universe seems to be amusing itself by watching for astrophysicists to develop a new theory explaining exoplanets, and then throwing nerf bricks at their heads in the form of new exoplanets that don't fit the pattern. Exoplanets will continue to be thrown until all the LULZ have been had.
Science is like playing Mastermind with a super-intelligent opponent who has set up the opposite end of the board but refuses to say whether your guesses are right or wrong.
Eh, give 'em time, they'll branch out. Right now the Universe seems to be amusing itself by watching for astrophysicists to develop a new theory explaining exoplanets, and then throwing nerf bricks at their heads in the form of new exoplanets that don't fit the pattern. Exoplanets will continue to be thrown until all the LULZ have been had.
Science is like playing Mastermind with a super-intelligent opponent who has set up the opposite end of the board but refuses to say whether your guesses are right or wrong.