How we could see another universe

Our universe may form one bubble of many in a vast multiverse. Cosmologists are now searching for signs of another bubble universe colliding with ours.

Illustrated: How we see the sky

Astronomers use a concept called the celestial sphere to understand the sky and its motions.

New technique closes in on dark energy

Astrocombing will revolutionize cosmologists’ method of measuring cosmic expansion.

Adam Block’s awesome universe

From an Arizona mountaintop, Adam Block introduces amateur astronomers to cutting-edge imaging.

Web extra: More of Adam Block’s awesome universe

See more of this reknowned astroimager’s breathtaking work.

Explore the Gem of the Milky Way

Summer’s Scutum Star Cloud holds numerous observing treats for any size telescope.

Discover the sky’s deepest, darkest secrets

Over three dark nights in southern Arizona, two observers track down dozens of the sky’s most exotic objects.

Web extra: Tales from the Arizona Sky Village

In October 2008, I got to spend 3 incredible nights under a pitch-black sky.

Orion’s low-cost APO delivers sharp images

The new EON refractor is affordable, portable, and well-built.


This Month in Astronomy
Web Talk
Bob Berman’s Strange Universe
Glenn Chaple’s Observing Basics
David H. Levy’s Evening Stars
Astro News
The Sky this Month
Stephen James O’Meara’s Secret Sky
New Products
Advertiser Index
Telescope Insider