Magazine

Science

Planets pierce the twilight

Science

Ask Astro web extra: Why do astronomers use the term right ascension?

Science

The ups and downs of a variable star

Science

When black holes merge

Science

Phil Harrington’s binocular universe: Exploring a Messier line-up

Observing

Stephen James O’Meara’s secret sky: Naked-eye denizens of the galactic deep

Observing

Glenn Chaple’s observing basics: A sure bet for observing fun

Observing, Science

A pair of summer eclipses

Science

How do planets, moons, and asteroids become round?

Science

How can astronomers know details about the appearances ancient comets?

Science

If photons have no mass, how can gravity bend light?

Observing, Science

What’s the best way to observe a meteor shower?