Magazine

Exoplanets, Planets

We often read of discovering exoplanets. How far away from Earth would we be “discovered” by another civilization with our current detection technology?

The Sun

A 12th-century sunspot enigma

Science

How do we know space is flat?

Astronomy for beginners

How were the constellation boundaries set?

Solar System

Asteroid awareness

Science

Laser crime and punishment

Deep-Sky Objects

Weird Object: Omega Centauri

Exotic Objects

Weird Object: Black Hole Cygnus X-1

Galaxies

Weird Object: ARP 220

Exoplanets, Planets, Robotic Spaceflight

Debra Fischer: All About Exoplanets

Exoplanets, Planets, Solar System

Weird Object: Pluto and Charon

Exotic Objects, Stars

A white dwarf pulls matter from its binary and explodes in a nova. Yet when the mass hits a certain limit, the star bursts in a type Ia supernova and is destroyed. Why the difference?