The Andromeda galaxy is surrounded by a constellation of dwarf galaxies that are arranged in a highly lopsided manner. Analysis of cosmological simulations published in Nature Astronomy reveal that ...

The newly discovered comet, C/2025 F2 (SWAN), is racing toward the Sun, and it may not survive its closest approach.

Catch two transits of Io, spot sparkling star clusters, and view Mars at aphelion while the April Full Moon lights the sky ...

The cluster, full of more than 2,500 newborn stars that blaze blue in the Hubble image, is in a galaxy with far fewer heavy chemical substances than the Milky Way. It's mostly made of hydrogen and ...

"A supercomputer simulation shows many galaxies merging over time. The parts of galaxies we can see are glowing stars forming ...

Upon discovery, astronomers were surprised to discover that the comet was already quite bright, shining at a magnitude of 10.

Skywatchers throughout the Northern Hemisphere are enjoying views of the newly discovered Comet SWAN.

A new comet has been discovered. Now getting closer to the sun and expected to brighten over the next few weeks, comet C/2025 ...