Gravitational waves slingshot them outside galaxies on a frantic, deep-space journey.
The ringed planet’s largest moon has methane rivers and possible volcanoes that spew ammonia-ice lava — could life be next?
In 2029, asteroid Apophis will pass dangerously close to Earth. Depending on its exact course, it may return with a vengeance in 2036.
Astronomers seeking life on other worlds first must understand how Earth would appear from far away.
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
Bob Berman’s strange universe
Glenn Chaple’s observing basics
Phil Harrington’s binocular universe
Big dipper, part one
The sky this month