Ganymede and Europa transit Jupiter tonight, while Io disappears in an occultation. West Coast observers can catch a double ...

Jupiter’s moon Ganymede is already famous for being the largest moon in the solar system. At more than 3,200 miles wide, it ...

See dazzling planets, the Milky Way and a trio of celestial animals brightening the spring sky around May's new moon.

Ganymede, Jupiter's largest moon, is also the solar system's largest satellite, even larger than the planet Mercury. It is ...

A rare blue moon will light up the sky in May as part of a month that will feature two full moons. The inspiration for everything from the classic song “Blue Moon” to the nickname of an All-Star ...

Jupiter’s large moon Ganymede begins passing behind the planet in an occultation late on the 27th. It then travels through the gas giant’s long, dark shadow to finally pop back into view early on ...

Today: The bright star Regulus is about a thumb width to the upper right of the moon at 9 p.m. They are five and a half fists held upright and at arm’s length above due south.

The Flower Moon will light up the night sky on the first day of May, which marks the midpoint between summer and spring. May's full moon, known as the Flower Moon, will peak on Friday, May 1. The ...

Less than two weeks after NASA’s Artemis II mission, the crew's observations from their lunar flyby are already providing insights into what it might take to build a base on the moon, NASA ...