Magazine

Science

How protoplanets create gaps in dusty disks

Science

What are the heliosphere, the termination shock, and the heliopause?

Science

Does dark matter clump together like ordinary matter?

Observing

Observing a bizarre stellar outburst

Observing

Stephen James O’Meara’s Secret Sky: Winter wreaths

Observing

Phil Harrington’s Binocular Universe: The Winter Triangle

Science

M81 and M82 on display

Science

Ask Astro web extra: How many planets have been discovered beyond Pluto?

Science

Bob Berman’s Strange Universe: Betelgeuse: the next banana split?

Science

Binocular Universe web extra: More Winter Triangle treasures

Stars

How many stars does our galaxy contain?

Science

The van den Bergh catalog