As planet-hunting scientists find more and more planets, they've encountered some puzzles. One of them concerns the lack of Neptune-size worlds orbiting close to their stars. Astronomers think that these planets aren't massive enough to retain their atmospheres in the face of their stars' powerful radiation, which strips it away.
As planet-hunting scientists find more and more planets, they've encountered some puzzles. One of them concerns the lack of Neptune-size worlds orbiting close to their stars. Astronomers think that these planets aren't massive enough to retain their atmospheres in the face of their stars' powerful radiation, which strips it away.
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