JPL News - Day in Review

Two Exoplanets May Be Mostly Water, NASA's Hubble and Spitzer Find 

Missions __ News __ Galleries __ Events EXOPLANETS Two Exoplanets May Be Mostly Water, NASA's Hubble and Spitzer Find Though the telescopes can't directly observe the planets' surfaces, their densities indicate they're lighter than rock worlds but heavier than gas-dominated ones. Read More

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