The Andromeda galaxy is the nearest large spiral to our Milky Way. Astronomers have suspected for some time it will eventually collide with our Milky Way. Now - thanks to the Gaia satellite - they know more.

Astronomers studying a globular star cluster accidentally discovered a more-distant galaxy behind it. The little galaxy is 30 million light-years away and is nicknamed Bedin 1. The videos in this post take you there.

This animation consists of 365 images of our sun, captured by ESA’s PROBA-2 satellite in 2018. See a montage showing the sun from day to day, and read more.

A new study suggests that Greenland ice is melting 4 times faster than in 2003. "We’re going to see faster and faster sea level rise for the foreseeable future," these scientists said.

An international consortium has been striving to obtain an image of the “shadow” of the event horizon of our Milky Way's central supermassive black hole. Here's an update.

The major planets in our solar system orbit, more or less, in a single plane. That's why you can look for them along the same sky path traveled by the sun and moon. Is the same true for exoplanets in distant solar systems?

Here's an alternative explanation to the Planet 9 hypothesis, the idea that a large undiscovered planet in the outer solar system is pulling on some small outer worlds, distorting their orbits.

Skywatchers! Check out this first video in the Chasing Darkness series, a stargazing destination guide. This episode - dark sky preserves in Alberta, Canada.

New clues from fossils from the oldest soils on Earth suggest that multicellular, land-dwelling organisms might have emerged much earlier than we thought.

Astronomers are arguing over a brief and unusual flash in the night sky from earlier this year. The call it the Cow. One group argues it was a monster black hole shredding a passing star. The other argues it might have been a black hole being born.