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So far, scientists have found 213 planets outside our solar system — they are called exoplanets. But only eight or nine are in the right orbit and location for the type of study reported by three teams using NASA’s Spitzer Space Telescope.
The two suns the planets orbit closely have hydrogen and oxygen, the stable building blocks of water. The planets’ atmospheres — examined for the first time using light spectra to determine the air’s chemical composition — are supposed to be made up of the same thing, good old H2O.