Mercury reveals its hidden side
NASA’s MESSENGER spacecraft found features on Mercury unlike any seen elsewhere in the solar system.
The MESSENGER spacecraft flew past Mercury January 14, giving scientists their first close-up view of the planet in 33 years.
Earth’s troubled adolescence
When a Mars-sized object rammed Earth and created the Moon, it launched a sequence of events that made our planet what it is today.
Could changing channels tune into alien civilizations?
A vast antenna farm in the Australian Outback may pick up the equivalent of talk radio and TV from other solar systems.
An international team is designing a radio telescope 100 times more sensitive than any of its kind. Here’s what it will look like.
Inside NASA’s Deep Space Network
If you think talking to a spacecraft across the solar system is a challenge, try juggling 30 of them. Here’s how NASA’s far-flung missions phone home.
Hear about the state of the art from the program manager of NASA’s Deep Space Network and the Spitzer Space Telescope’s mission manager.
How to observe dark nebulae
Challenge yourself to find a dozen cold, dark clouds among the stars.
Use this Autostar tour with your computerized Meade telescope.
Tele Vue’s new eyepiece field tested
The Ethos offers an ultrawide field of view at high power.
Choose the dome that’s right for you
Set up one of these three domes, and next time you observe you’ll feel like a pro.
This month in Astronomy
Bob Berman’s strange universe
Stephen James O’Meara’s secret sky
The sky this month
Glenn Chaple’s observing basics
Phil Harrington’s binocular universe
Peruse the Water Snake’s other half