Shrinking Planet
Photo Credit: ESA, A. Vidal-Madjar (Institut d'Astrophysique de Paris, CNRS, France) and NASA

 
A year on HD209458b is only 3.5 Earth-days long. The planet orbits so close to its star that its atmosphere is being blown away by gales of stellar wind. Scientists estimate the planet is losing at least 10,000 tons of material every second. Eventually, only a dead core of the shrinking planet will remain.
Number 2: Sniffed Atmosphere
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