2011

The world's best-selling astronomy magazine offers you the most exciting, visually stunning, and timely coverage of the heavens above. Each monthly issue includes expert science reporting, vivid color photography, complete sky coverage, spot-on observing tips, informative telescope reviews, and much more! All this in an easy-to-understand, user-friendly style that's perfect for astronomers at any level.

Eyepiece showing field stop

Telescopes and Equipment

What is the difference between a 2″ eyepiece and a 1¼” eyepiece?

Observing, Observing Basics

Why aren’t the constellations always drawn the same way?

Editor David J. Eicher’s top 20 Queen songs: 10-1

How do astronomers determine what causes starlight to shift toward the red end of the electromagnetic spectrum?

Sharing the Adirondack sky

The miracle of Lab Color

The super secret sky

Cash and infinity

Deep-freeze astronomy

I understand that new stars form out of mostly hydrogen with smaller amounts of heavier elements. If helium, carbon, oxygen, and other heavier elements were abundant enough to form stars, could they?

Why are most impact craters nearly perfectly round? I’d expect the impacts to result from an obtuse or glancing blow that would leave an oblong or ellliptical shape.

Why do the gas giant planets have so much gravity when they do not have solid cores like the terrestrial planets? Or do they have solid cores?