Beta Lyrae, an eclipsing binary, is one of the brightest and easiest-to-find variable stars in the sky.

Mira, the closest and brightest of the red long-period variable stars, has thrown off a gassy hood and a comet-like tail so big that if you could see them, they would overflow your telescope's field of view.

Astronomers have resolved carbon soot clouds around one of the sky's best-known R Coronae Borealis–type variable stars.

A naked-eye nova erupted in the pre-dawn sky in early February and peaked at magnitude 3.8 on February 16th. As of the 27th it was still an easy binocular target at magnitude 5.4. And in the midst of the excitement, a second, fainter nova went off just below it.

The red, Mira-type variable star Chi Cygni has had a very unusual maximum. It's one of the brightest such variables to begin with (typically peaking at about magnitude 5.2), but in late July and early August 2006, it peaked at about magnitude 3.8.

Studying and recording the ups and downs of variable stars is a pleasant pastime that can also be scientifically rewarding. Here's a simple project to get you going.

Why do larger numbers mean less light? Here's the story of astronomy's odd but beloved scheme for describing star brightnesses.

This red long-period variable is sometimes visible to the unaided eye — and sometimes invisible even in a 4-inch telescope.

One is usually bright but fades unexpectedly; one is almost always faint but brightens unexpectedly. Check them out with binoculars.

Lurking in the seemingly changeless constellations are a few inconstant stars that pulse and eclipse. Here are a dozen variables that are easy to observe.

Now you can calculate the dates and times (local and Universal Times) when the eclipsing variable star Algol should be at its dimmest (magnitude 3.4 instead of its usual 2.1).

The satellite caught tantalizing pieces of light curves for many new variable stars. Now it's time to fill in the details.

Some of the Hipparcos satellite's unfinished business provides fair game for backyard observers.