Space scientists aren’t so sure. As light travels from space to the ground, it scatters off molecules in the atmosphere, says ...

(NASA/SAO/CXC/Mustafa Muhibullah (University of Alabama)) When we look at the night sky, darkness seems to fill the spaces ...

Astronomers had already classified some celestial objects that emitted low-energy X-rays as “supersoft.” The new objects emit just the lowest-energy slice of supersoft X-rays, so the researchers call ...

A small world 4.5 times Earth's mass is circling its star in the wrong direction. Normally there's a bully nearby to blame.

In a new study, astronomers detail observations of what could be the first known exosatellite - a natural object orbiting a ...

NASA’s Chandra has uncovered 84 unusual cosmic objects producing extremely soft X-rays and intense ultraviolet radiation.

A new simulation suggests little red dots, unusually compact objects seen in photos from space, might be one stage in the ...

Light exhibits some of the strangest properties in our cosmos. It manifests as both a wave and a particle, and its speed in a ...

For more than 30 years, astronomers have been searching for a particular kind of black hole. They knew it should exist somewhere in our galaxy, but they just couldn’t find one. Now, they’ve finally ...

The map covers 75% of the sky, and you can explore all sorts of cool celestial objects once you know where to look.

It’s unclear what these objects actually are, but evidence for them has been detected by NASA’s Chandra space telescope for years ...

Planets without stars to orbit raise important questions about how planets evolve and what habitability might look like ...