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 ...

Jupiter is a cosmic vacuum cleaner. Owing to its girth — the gas giant wields the mass of 318 Earths — Jupiter can pull many objects into its orbit (though it can fling some toward Earth's ...

Man, Jupiter’s moons are a lot cooler than ours. The spacecraft New Horizons captured this gigantic exploding volcano on its moon Io, the most volcanically active body in the solar system. It seems ...