Earth's atmosphere scatters sunlight, making the sky appear blue due to shorter blue light waves. Longer waves, like red and ...

Mars changed from a blue world with water to a red desert because its atmosphere escaped into space over billions of years.

A bevy of comets, a "blood moon" total lunar eclipse and impressive northern lights were just three of the skywatching highlights in 2025. Here's how they unfolded.

Saturday's launch marked Blue Origin's 16th New Shepard flight with passengers aboard since Bezos, his brother and two others ...

Mars at sunset reveals dozens of razor-thin atmospheric layers in stunning detail, helping scientists map dust and ice ...

The northern and southern lights, especially active lately, have been treating sky watchers to spectacular shows. But what ...

The astronauts and cosmonauts aboard the International Space Station spent their first full week as Expedition 74 crewmates.

With major eclipses, brilliant supermoons, and lineups of five or more planets, 2026 offers something awe-inspiring in every season. Here’s what to watch for.

NASA has lost contact with MAVEN, a spacecraft that has been orbiting Mars for more than 11 years and one of only three ...

Comet 3I/ATLAS is a rare visitor passing briefly through our solar system. Here’s how to find it in the night sky—and what ...

A number of factors determine the visibility of the moon during the daytime, chief among them the scattering of the sun’s ...

A common kestrel hovers gracefully above bare branches in the quiet of a misty morning, its silhouette standing out against the calm blue of the foggy woods.