Pictures of black holes have a white outline around them when photographed, due to one of black holes’ unique and key features.

Sound needs matter to propagate, so the vast vacuum of space is not just empty − it’s silent.

Kip Thorne and Lia Halloran team up to demystify complex science from black holes and wormholes to time travel and gravitational waves.

The universe is expanding faster than physicists would expect. To figure out what processes underlie this fast expansion rate, some researchers are first trying to rule out what processes can’t.

Using multiple observatories, astronomers directly detect tellurium in two merging neutron stars.

Researchers achieve a landmark in quantum squeezing.

Controlled experiments are impossible in astronomy, as are direct measurements of physical properties of objects outside our solar system. So how do astronomers know so much about them?

Measuring the ages of planets and stars is tricky. An observational astrophysicist describes the subtle clues that provide good estimates for how old different space objects are.

The Center for Astrophysics | Harvard and Smithsonian’s results bolster hypothesis of how galaxy evolved.

The frosty gas giant was discovered in a system that also hosts a warm Jupiter.