Whether you're a seasoned stargazer or a backyard observer with binoculars, the final week of May offers a treasure trove of celestial events.

A recent study found that Jupiter was once twice the size that it is now, making it big enough to swallow up 2,000 Earths.

Discover interesting facts about how the moon formed, what it's made out of, and the many missions humans have launched to ...

Our satellite is a little off-balance. GRAIL data show a mass asymmetry of a few percent between its near and far sides.

Scientific American spoke with the astronomer who has contributed to the discovery of two thirds of Saturn’s known moons ...

Stunning new Jupiter photos from NASA’s Juno spacecraft reveal storms, cloud bands, and its volcanic moon Io as the mission ...

Jupiter wasn’t always the planet we know today—it was once twice as big, had a magnetic field 50 times stronger, and its ...

NASA’s GRAIL mission reveals thermal differences in the moon’s mantle, explaining surface contrasts between its sides.

Scientists have uncovered fascinating new details about the internal structures of both the moon and the asteroid Vesta using ...

Europa Clipper tested its infrared camera during a Mars flyby, preparing for its 2030 mission to Jupiter’s moon Europa.

An exhaustive examination of lunar gravity using data obtained by two NASA robotic spacecraft is offering new clues about why ...

NASA scientists said Wednesday that they’ve unearthed new secrets about the moon. Specifically, they’ve gotten a better look ...