What happens when black holes collide?

Gravitational waves slingshot them outside galaxies on a frantic, deep-space journey.

Saturn’s Titan reveals earthlike surprises

The ringed planet’s largest moon has methane rivers and possible volcanoes that spew ammonia-ice lava — could life be next?

Fatal attraction

In 2029, asteroid Apophis will pass dangerously close to Earth. Depending on its exact course, it may return with a vengeance in 2036.

Searching for signs of life

Astronomers seeking life on other worlds first must understand how Earth would appear from far away.

Red Planet Rendezvous

Fly over Mars’ rugged Valles Marineris and witness mammoth landslides, steep cliffs, and whirling dust devils.

All about the Whirlpool Galaxy

For amateurs and professional astronomers alike, this face-on beauty ranks as a celestial show piece.

The little comet that might

Uncertainty about how bright Comet 73P/Schwassmann-Wachmann 3 will be makes it a must-watch object this spring.

Astronomer for a night

Kitt Peak National Observatory provides a unique fantasy camp for amateur astronomers.

Ticket to the stars

Whether you’re a beginner or advanced observer, don’t leave home without Astronomy’s new star guide.


This month in Astronomy
Beautiful universe
Bob Berman’s strange universe
Glenn Chaple’s observing basics
Phil Harrington’s binocular universe

Big dipper, part one

The sky this month
New products
Book reviews
Coming events
Advertiser index
Reader gallery