A possible Jupiter-sized object circling the brown dwarf CD-35 2722 b has implications for planetary science, including what counts as a moon beyond our own solar system.

The Sun passes the celestial equator moving south today, marking the Northern Hemisphere’s transition to autumn.

Here's what's launching Sept. 21–27: two Chinese rockets go up, Rocket Lab delivers an Earth-observation satellite, and SpaceX closes things out with a national security mission for the U.S. Space ...

Rising around 7:30 P.M. local daylight time, Saturn reaches an altitude above 40° in the southeast by local midnight. Visible ...

Our current planet-hunting techniques are unable to detect an Earth-like planet in an Earth-like orbit around a Sun-like star.

Eclipses frequently come in pairs, and this month is no exception. Following the stunning total solar eclipse on August 12, it’s the Moon’s turn to line up for some time in — or, rather, out of — the ...

Now is the best time to catch 145-mile-wide 3 Juno as it passes through a random collection of 9th- and 10th-magnitude stars.

Dione crosses Saturn’s north pole, projecting its shadow onto the cloud tops as Tethys disappears into the planet’s shadow.

Air Force Secretary Troy Meink's announcement is the first official U.S. acknowledgment of space-based weapons.

Dark-sky sights take center stage as Saturn's moons dance and Venus mingles with the Moon in the sky this week.

Europe's Vega C lifts a pair of Earth-observation satellites from French Guiana, China targets five launches, and Russia ...

Three celestial objects form a triangle in the evening twilight as Venus and the crescent Moon hang with Virgo’s brightest ...