NASA's spinning spacecraft studying the satellites of the solar system's largest celestial body (aside from the sun), may already be switched off, but the space agency won't say. The Juno probe ...

For more than a century, cosmic rays have remained one of astronomy’s lingering puzzles. These tiny particles move through space carrying extraordinary amounts of energy, arriving from distant corners ...

Next Wednesday Oct. 9, the Juno spacecraft will make an extremely close approach to Earth as part of a gravity assist maneuver to boost to it to Jupiter. The probe was launched on Aug. 5, 2011 on a ...

Ganymede’s auroras have always stood apart for one simple reason: this is a moon, not a planet, and yet it carries its own ...

As NASA's Juno flew around Jupiter last week, the spacecraft snapped a photo of an object before it could make a clean getaway. That clunky, bumpy thing at the far right edge of the frame is Thebe, ...

Jupiter, the biggest planet in our solar system, is not as big as we thought. For more than half-a-century, astronomers thought they had a good idea of the gas giant's shape and size. Now, a fresh ...