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

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

Here's what's launching Sept. 21–27: two Chinese rockets go up, Rocket Lab delivers an Earth-observation satellite, and ...

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

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.

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

The Red Planet stands a few degrees south of the bright star Pollux in Gemini, easily visible in the early-morning sky.

High in the eastern sky this evening you’ll find the zig-zagging constellation Lacerta, home to several lovely and relatively bright open star clusters. Tonight, let’s check out the brightest of those ...

Uncover various deep-sky objects you can see this fall using a large telescope, including the Bubble Nebula (NGC 7635), the ...

Our satellite skims past the bright red giant star Antares at the heart of Scorpius. Check them out in the south after sunset.