Here's an observers' guide to the newly discovered Comet 2025 F2 (SWAN), which is visible in northern skies right now.

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

If it exploded today, this future supernova might be close enough to us to pose a threat, but the Sun will have burned out ...

In 1923, Edwin Hubble captured a pulsing star within the Andromeda Galaxy on a glass photographic ... even the largest black holes are tiny in the sky because they are so far away.

In a study published in The Astrophysics Journal, a Michigan State University researcher used the NASA Chandra X-Ray ...

The planet Saturn illuminates the sky Oct. 20. This photo was taken ... where you can see the individual stars; you can see Andromeda Galaxy. So there’s a lot of cool things you can see.” ...

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 ...

A bright star within our Milky Way galaxy photobombed a beautiful new image of a distant galaxy with "patchy" spiral arms.

Four planets in the solar system are about to appear in alignment in the night sky. Here's how stargazers will be able to see ...