Magazine

Cosmology

Gravity decreases with distance. Could the repulsive force of dark energy increase with distance, causing the universe’s expansion to accelerate?

Stars

“Pop-up” stars in Boötes

Robotic Spaceflight

More lovely Spitzer images

Observing

Binary stars in action

Planets

Happy birthday, Neptune!

Science

Ask Astro web extra: How does Earth compare to the rest of the planets in our solar system in radio wave emission?

Galaxies

What causes the central bar in some spiral galaxies?

Solar System

What lies beyond the planets

Observing

Working with Hydrogen-alpha data, part 1

Science

The AAVSO turns 100

Science

Pioneering astronomy at Lick Observatory

Solar System

Have astronomers detected elements in the universe that aren’t found in our solar system?