As many as 400 volcanoes are erupting on the surface of Jupiter's innermost moon Io, with virtually every square inch of the ...

If conditions are clear, anyone with a pair of binoculars or a telescope may even be able to pick out details, such as Jupiter’s four largest moons — Ganymede, Callisto, Io and Europa. The four ...

Last year saw the launch of a European probe called the Jupiter Icy Moons Explorer (JUICE). It will likewise examine Europa, ...

Discovered by Galileo in 1610, Europa is one of the four so-called Galilean moons of Jupiter, along with Ganymede, Io and Callisto. What type of life might Europa harbor? Besides water ...

German astronomer Simon Marius is best remembered for his disputes with Galileo Galilei over priority for discovering Jupiter ...

Hundreds of volcanoes and lava lakes on Jupiter’s moon Io are likely powered in the same way as Earth’s volcanoes.

The winter stars are like that. They're bright, sparkly and arrive "from a distance" low on the eastern horizon and gradually ...

A Cold Moon hangs in the sky while Jupiter still shines bright and the Geminid meteor shower peaks in the sky this week.

NASA and ESA’s Hubble Space Telescope has been observing the outer planets through a program called OPAL (Outer Planet ...