For a short time, dear Luna has a friend. The asteroid 2024 PT5 spans just 33 feet (10 meters) and won’t even orbit Earth ...

Comet Tsuchinshan-ATLAS reaches perihelion, Venus is a bright evening star, and the New Moon passes in front of the Sun in ...

Astronomers comparing data taken by Dawn with models of Ceres on Earth determined that organics on its surface came from ...

JWST discovers that accreting black holes may be to blame for reports that hinted early galaxies were too big for their ...

The citizen science app, available in eight languages, uses public input to identify kilonovae, neutron star mergers that ...

An issue called the final parsec problem detailed the theoretical difficulty in bringing supermassive black holes close ...

An experiment with powerful pulses of energy sent test targets flying in a step forward for planetary defense.

The plumes stretch farther than any yet seen, reaching millions of light-years long and potentially influencing the cosmos ...

A famous radio signal from space long considered as a possible sign of another civilization, in the end, falls flat.

Neptune reaches opposition today at 8 P.M. EDT in the constellation Pisces. Opposition is generally the best time to view ...

On September 22, our satellite passes in front of the famous star cluster M45 in a rare, breathtaking event, producing ...

Our Earth is about 4.5 billion years old and, through careful work, scientists have pieced together a timeline of its past.