Astronomy

And why is the black hole at the center of our own galaxy so dim?

A problem confronts cosmology: Two independent measurements of the universe’s expansion give incompatible answers. Now a third method, advanced by an astronomy pioneer, appears to bridge the divide.

By watching for a special kind of flare, astronomers have identified the fingerprints of an Earth-size planet orbiting a distant star.

As astronomers get better at finding the comets and asteroids of other stars, they’ll learn more about the universe and our place in it.

A surprisingly youthful estimate of the age of the rings has stirred a backlash.

How a young celebrity became one of the first female astronomers at Caltech, befriended Richard Feynman, and ended up the world’s foremost chronicler of the science of the night sky.

The astronomers Michel Mayor and Didier Queloz won half of the prize for their 1995 discovery of a Jupiter-like planet orbiting a nearby star. The cosmologist James Peebles won the other half for work exploring the structure of the universe.

A giant star’s death throes may offer the first evidence of a pair-instability supernova, and a glimpse of the first stars in the universe.

New measurements could upend the standard theory of the cosmos that has reigned since the discovery of dark energy 21 years ago.