Features

Putting Hubble Right

Endeavour’s crew made the Hubble servicing mission look easy. The big question now is whether the optical fixes work.

Hypergiants

These massive stars push the limit of how big and bright a star can get.

Seven Mysteries of Galaxies

How do galaxies form and evolve? Astronomers struggle to understand these basic building blocks of the universe.

Sky Almanac

The morning sky abounds with activity as the Moon slides by Uranus and Neptune on March 7 and Mercury passes 0.3 degrees south of Saturn on March 24.

Copernicus and Mare Insularum

You’ll see most of the Moon’s history on display around the crater Copernicus.

Taking the Deep-Sky Plunge

Are you ready to dive into deep-sky observing? Here are a few tips from a pro.

Running a Celestial Marathon

Backyard observing’s answer to the ultimate distance race is a grueling one-night marathon to view all 100-plus objects in the Messier catalog.

Losmandy’s Telescope Mounts

If a sturdy platform and superb tracking matter to you, check out these two portable mounts.

Virtual Sky

Galaxies, nebulae, and the Moon highlight a star-studded portfolio of CCD images.

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