The predawn hours of Aug. 8 present a perfect opportunity to see Jupiter's four largest moons line up next to the "King of the Planets" as it voyages through the stars of the constellation Gemini.

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The hellish surface of a moon of Jupiter known as Io is riddled with hundreds of lava-spewing volcanoes that make the world one of chaos and violence. The brutal conditions also make Io intriguing to ...

How many moons does Jupiter have? Scientists have discovered dozens of them, but the answer may be more complicated than it seems. When you purchase through links on our site, we may earn an affiliate ...

Northeast a reason to look up and marvel after sunset.Sunset is expected around 4:30 p.m. Eastern time on Wednesday. As the sky darkens, the Moon will appear about one-third of the way from the ...

Two bright wanderers share the autumn sky as Jupiter rises beside the half moon. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. If you're up ...

A comet from another star system will swing by Mars on Friday as a fleet of spacecraft trains its sights on the interstellar visitor. We already know a decent amount about how planets form, but moon ...