Magazine

Stars

Sirius, our brightest star, is orbited by a white dwarf — a dead star’s core. Where is the planetary nebula that would have formed when it shed its skin?

Alien Life

Brains in a box

Exoplanets, Planets, Solar System

Rainy eclipse

Exoplanets, Planets

At tens, hundreds, or thousands of light-years from a star, how do you distinguish between exoplanets, sunspots, and dwarf binary companions?

Solar System

Web Extra: Under Rosetta’s watchful eye

Stars

Web Extra: Black widow star destroys its mate

Exoplanets, Planets, Solar System

On the martian surface, would the moons Deimos and Phobos be visible to the unaided eye?

The Moon

What exactly is a degree in terms of the distance between stars?

Cosmology

What happens if string theory is wrong?

Astrophotography

Sketch Minkowski’s nebulae

Exoplanets, Observing, Planets, Solar System, The Moon

Totality’s long embrace

Stars

Weird Object: Eta Carinae and the Homunculus Nebula