Features

The Mars That Never Was

Forty years ago, space artist Chesley Bonestell fired an entire generation’s imagination with visions of Martian canals, wetlands, and possible primitive life.

Epsilon Eridani: The Once and Future Sun

This young, nearby star bears a close resemblance to the Sun in its early days, and may one day nurture intelligent life.

Our Strange, Scrappy Ancestors

Hubble reveals a new class of very distant, fragmentary galaxies that may be the most abundant kind in the universe.

Gamma-Ray Bursters: Near or Far?

Debate rages over whether these powerful explosions originate in the outskirts of our galaxy, or far across the universe.

Sky Almanac

Geminid meteors will be shooting across mid-December’s evening sky, a fitting encore after watching six planets low in the western twilight.

Test-driving Celestron’s Apo Refractor

This redesigned 4-inch apochromat features superb optics on a sturdy German equatorial mount.

The Secrets of Orion’s Great Nebula

A medium-size scope reveals stunning detail in winter’s showpiece deep-sky object, but the right filters will help you see new shapes and boundaries.

Building an Astronomical Library

The right books can help you get the most out of your astronomy pursuits.

When Galaxies Strut Their Stuff

Face-on spiral galaxies offer observers with small scopes their best look at mottled arms, pointlike nuclei, and star-forming regions.

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