Probing the Atmosphere of an Extrasolar Planet - Universe Today
Astronomers working with the Canadian Microvariability & Oscillations of STars (MOST) space telescope have been able to indirectly probe the atmosphere of a planet orbiting another star. The planet, HD209458b, was imaged earlier this year by NASA's Spitzer space telescope; it's a "hot jupiter", orbiting very close to its parent star. MOST will watch how its parent star changes in brightness as the planet passes in front and behind, and should be able to provide details about its temperature, pressure, and even cloud cover.
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