What if string theory is wrong?
If it is, then dark matter, dark energy, and cosmic inflation are in big trouble.
Mars like you’ve never seen it
The first color images from the Mars Reconnaissance Orbiter’s high-resolution camera show details not much bigger than a bread box.
What makes Mira tick?
Changes in this star”s complex atmosphere power its pulsations.
How astronomers glimpse the naked galaxy
By observing in infrared wavelengths, astronomers peer through obscuring dust and reveal the Milky Way”s spiral structure.
Enjoy a dozen more great images from Spitzer.
When planets stray
Wayward worlds unleash a rain of ruin in their neighborhoods.
Once upon a time, two giants roughed up the neighborhood.
Explore winter’s 12 best star clusters
These must-see stellar treats look their best in winter’s crisp, clear air.
Here”s a mini photo album of winter”s best.
Big bang for your astronomy bucks
A few dollars can add value to your observing kit.
Simple steps to save the night sky
Light pollution is a growing problem, but you can help curtail it.
Rangers work to preserve the dark night skies above our national parks.
Get the most from CCD images
CCD cameras are revolutionizing astroimaging, enabling amateurs to capture more detail than ever.
No telescope? No problem. Just pull out this handheld device, and you’ll be identifying stars in no time.
This month in Astronomy
Bob Berman’s strange universe
Glenn Chaple’s observing basics
Phil Harrington’s binocular universe
The hunter becomes the hunted
The sky this month