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JUMBO-SIZE PLANET  Big rocky super-Earths such as Kepler-62f, shown in this illustration, probably don’t have active plate tectonics, new research suggests. 

helium-rich skies

SQUEAKY PLANET  A world with helium-rich skies (illustrated) might be blanketed in white or gray clouds, researchers report.

Illustration of exoplanet 55 Cancri e

The partially molten surface of 55 Cancri e (left, illustrated) might periodically be blanketed by volcanic dust (right), which could explain observed temperature swings of over 1,000 degrees Celsius.

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