Scientists puzzle over ‘super-puff’ planets

Super-puff planets

An illustration depicts the sunlike star Kepler 51 and three giant planets that have an extraordinarily low density. (NASA / ESA / STScI / Hustak, Olmsted, Player and Summers)

Readings from the Hubble Space Telescope have shed light on a bizarre class of alien planets that have the density of cotton candy.

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About Alan Boyle

Aerospace and science editor for GeekWire, creator of Cosmic Log, author of "The Case for Pluto: How a Little Planet Made a Big Difference," president of the Council for the Advancement of Science Writing. Check out "About Alan Boyle" for more fun facts.
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