A mere 200 light-years away, there's a planet with the density of styrofoam and clouds of sand. How did it get so weird?
The Horsehead Nebula and other stunning scenes highlight the talents of the just-launched Euclid mission. The telescope will reach into the depths of the cosmos to understand dark matter and dark energy.
Radio observatories across the globe have found compelling evidence for the existence of very-low-frequency gravitational waves.
Flashes of radio waves — whose exact sources are still a bit of a mystery — are helping astronomers learn about the hot gas that surrounds the Milky Way.
An arc that glows green thanks to doubly ionized oxygen appears near the Andromeda Galaxy in a photo obtained by amateur astronomers.
Hypervelocity clouds, generally thought to be falling fast into the Milky Way, might have an alternative explanation that places them near us.
The asteroid that wiped out the dinosaurs 66 million years ago might not have arrived alone.
Distant galaxies in Webb images suggest we need to rethink star and galaxy evolution in the early universe.