Magazine

Science

What determines the particular shape of nebulae like the Dumbbell, Trifid, and Lagoon?

Science

Who first measured the speed of light? What method was used?

Observing

Stephen James O’Meara’s Secret Sky: Moonbows: architecture of light

Observing

Glenn Chaple’s Observing Basics: Solar safety

Observing

Stephen James O’Meara’s Secret Sky: Magic times on the Sun

Science

Ask Astro web extra: Why does the Moon look so large sometimes as it rises on the horizon?

Science

More Salman Sharpless objects

Science

A dying star gives birth to planets

Science

Is it possible to combine digitized observations of an object from widely separated telescopes, creating a virtual interferometer?

Science

Is there an equivalent to the North Star in the Southern Hemisphere?

Science

Bob Berman’s Strange Universe: Facing reality

Science

Catalog of Cygnus planetary nebulae