What exists beneath the surface of Jupiter's icy moon, Callisto? This is what a recent study accepted by The Planetary Science Journal hopes to address as a team of researchers investigated the ...

On January 7, 1610, the Italian astronomer Galileo discovered three of Jupiter's moons: Callisto, Europa and Io. When he looked at Jupiter through his telescope, he saw what he thought were three tiny ...

On Jan. 7, 1610, Galileo Galilei turned his self-built telescope, which he had recently made improvements to, towards Jupiter. There he noticed three spots of light. Though he first concluded they ...

Breakthroughs, discoveries, and DIY tips sent six days a week. Terms of Service and Privacy Policy. The stargazing calendar for 2026 gets off to a bit of a contrary ...

An Ariane 6 launches two Galileo navigation satellites Dec. 17. Credit: ESA-CNES-Arianespace-ArianeGroup/Optique vidéo du CSG - S. Martin WASHINGTON — An Ariane 6 rocket placed two satellites for ...

Europe has given fresh momentum to its Galileo navigation system following the successful Dec. 17 launch of two new satellites aboard an Ariane 6 rocket. The launch, the 14th of the program (L14), is ...

An artistic rendering of a dust and gas disk encircling the young exoplanet, CT Cha b, 625 light-years from Earth. Spectroscopic data from NASA’s JWST suggest the disk contains the raw materials for ...

Spiders from Mars? Try Europa. A team of planetary scientists from Ireland have examined and named an intriguing feature on the surface of Jupiter’s icy moon that resembles the shape of an arachnid — ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Have you seen the “Christmas Star?” Step outside after dark ...

Astronomers recently detected a stray quasi-moon in our planet’s orbit, but it's hardly the first stowaway to hang out around Earth. Unlike the Earth's moon, quasi-moons are not gravitationally bound ...

The recently spotted asteroid 2025 PN7 appears to be the source of the rumor mill about Earth's supposed second moon. Earth has several quasi-moons that get their name due to the fact that they ...

Humanity’s relationship with the moon has always been simple. One planet, one moon — a cosmic partnership as reliable as sunrise. But that clarity just got murkier. Astronomers have confirmed ...