Exoplanets: Too hot, too windy, and too big to exist

By John Timmer

The massive “mega-Earth,” Kepler-10c, shown orbiting outside of Kepler-10b, a massive lava world that completes an orbit in less than a day.
David A. Aguilar

The American Astronomical Society is holding its 224th meeting in Boston, and the talks have been full of exoplanets. We’ve got one that shouldn’t exist, two that won’t exist for much longer (in astronomical terms), and a whole class of planets that could have trouble holding on to their atmospheres.

First are the two temporary residents of the Kepler-65 system, which have the misfortune of orbiting close …read more

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