Astrophysics

Cosmology

What is dark energy?

Science, Space Exploration

Starmus La Palma: The Island of Stars lineup revealed 

Observing

How Yerkes Observatory started over

Exotic Objects, Galaxies

XRISM’s data debut proves its extraordinary capabilities

Cosmology, Galaxies, Science

Dark Energy Explorers: How you can help unravel one of the universe’s biggest mysteries

Alien Life, Exotic Objects

The “Wow! Signal,” not surprisingly, was a dud

Exotic Objects

How can a black hole pull light into itself if a photon is massless?

Solar System, Stars

Waves may be heating the solar wind — and two spacecraft caught them in action

Galaxies, Science

Event Horizon Telescope captures highest-resolution images ever taken from the ground

Cosmology, Exotic Objects

How merging black holes could reveal the nature of dark matter

Science

Astronomers are rallying to save NASA’s Chandra X-ray Observatory

Science

How does spectroscopy work?