Scientists once thought luminiferous ether pervaded the cosmos. Michelson and Morley’s ingenious experiment to find it ...

The strange lunar swirl Reiner Gamma marks a starting point to explore several craters visible near the lunar terminator ...

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

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

Discover how star clusters influence galaxy evolution and planet formation, revealed by JWST in a groundbreaking study.

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

In a groundbreaking announcement, the U.S. Space Force stated publicly on Monday, Sept. 14, that it currently has on-orbit ...

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

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

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.

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

A possible Jupiter-sized object circling the brown dwarf CD-35 2722 b has implications for planetary science, including what ...