Magazine | Page 194 of 281 | Astronomy.com

Is it true that there are more stars in the universe than there are grains of sand on Earth? How could one calculate such figures?

Name that crater

Watch exoplanet HD 189733b in action

What is the largest rocky extrasolar planet ever found and its size comparison to Earth?

Robotic Spaceflight

Why can’t the recently launched Herschel Space Telescope produce sharper images than the Spitzer Space Telescope?

The year’s big stories

David H. Levy’s Evening Stars: One world, one sky

Stephen James O’Meara’s Secret Sky: Readers search for shadow bands

Observing, Telescopes and Equipment

I have an 8-inch telescope but can see only Mars as orange instead of red. All other planets appear colorless. Why?

A gallery of winter wonders

Science, Solar System

Why hasn’t the asteroid belt formed a planet?

Astro Confidential: Getting to know Jim Head