Magazine

Alien Life, Cosmology, Robotic Spaceflight

Jeff Hester: Life and the Universe

Exotic Objects

Weird Object: Black Hole Sagittarius A*

Solar System

Weird Object: Elst-Pizarro

Deep-Sky Objects, Stars

Web Extra: Astronomers animate one of the largest galaxy clusters ever observed

Exoplanets, Planets, Solar System

Is Jupiter’s Moon Amalthea ever visible in amateur instruments? If so, what aperture and magnification are needed, and when is a good time to try?

Stars

I read that once every second, somewhere in the universe a massive star ends its life as a supernova. How does that compare to the rate of new star formation?

The Moon

The Reiner swirl

Exoplanets, Human Spaceflight, Planets, Robotic Spaceflight, Solar System

Why won’t the new Horizons spacecraft stop or slow down when it gets to Pluto?

Astrophotography

Web Extra: Capturing a colorful sky

Deep-Sky Objects

Two perspectives

Exoplanets, Planets, Solar System

Shadow secrets

Human Spaceflight

Why doesn’t the International Space Station rotate to create artificial gravity like stations in the movies?