Van Allen Belts Protect Earth from Solar Wind
June 11, 2018
Geophysicists are still puzzling over how the earth's magnetic field and Van Allen radiation belts protect the surface from deadly particles in the solar wind.
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Cassini Grand Verdict: Saturn Rings Younger Than Expected
August 30, 2017
With the orbiter's best-yet images and data now coming down, a long-running debate about the age of Saturn's rings is concluding in favor of youth.
Trending: Moons With Oceans
October 14, 2016
Europa has one. Enceladus has one. Titan might have one. Now, it seems every moon wants an ocean under its crust.
Density Can’t Keep Saturn’s Rings Old
February 4, 2016
Saturn's B ring is much less dense than previously thought, challenging attempts to keep it billions of years old.