Hubble Makes First Measurements of Earth-Sized Exoplanet Atmospheres
On May 4th, 2016, the Hubble Space Telescope made the first spectroscopic measurements of two of the three known Earth-sized exoplanets in the TRAPPIST-1 system just 40 light-years away. Now the results are in: a thick, puffy, hydrogen-helium atmosphere is likely ruled out from the possible range of atmospheres for these two planets.
Additional visuals from the European Southern Observatory can be downloaded here: http://www.eso.org/public/news/eso1615/E
Animation - Artist concept of the double-transit Hubble observed on May 4, 2016, when planets TRAPPIST-1b and TRAPPIST-1c passed across the disk of their host star just minutes apart.
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NASA's Goddard Space Flight Center