The secret lives of black holes
A black hole’s spin may power gamma-ray bursts and galactic jets. But its rotation has been hard to measure – until now.
See what astronomers are talking about with these animations of black holes.
Earth of the outer solar system
Each Cassini flyby of Titan fills in the details of this frostbitten saturnian moon shaped by forces identical to those that sculpted Earth’s surface.
Images from orbit highlight striking similarities between Earth and Titan.
The priest, the universe, and the Big Bang
A Belgian priest’s extraordinary insights anticipated modern cosmology’s most fundamental ideas.
The Belgian priest loved crunching numbers, and he embraced technology that helped him do it.
Illustrated: Making sense of galaxies
Astronomers’ efforts to explain galaxy types brought them from a tuning fork to a lemon.
How to observe variable stars
If your observing list doesn’t contain variable stars, here’s an easy guide to some of the finest.
Watch these stars’ brightnesses change before your very eyes.
Who will save us from a killer asteroid?
Meet astronomers on the front lines of protecting Earth.
Researchers may have discovered a previously unknown scar from the 1908 Tunguska meteor explosion: a deep crater lake.
Astrolight reflectors offer quality optics
Parks Optical’s 6- and 8-inch Newtonian reflectors deliver top-notch optics at a reasonable price.
Is LASIK for you?
Like any surgery, laser vision correction has pros and cons – especially for observers.
Don’t be reluctant to “interview” your doctor before you have LASIK or other vision-correction procedures.
This month in Astronomy
Bob Berman’s strange universe
Glenn Chaple’s observing basics
Web extra: Spy a solar system wanderer
Phil Harrington’s binocular universe
Web extra: The sky’s Triangle
Stephen James O’Meara’s secret sky
The sky this month