March 2021 Cover

Betelgeuse, the Asteroid Belt, and the Beehive Cluster

In the March 2021 issue of Sky & Telescope, we reveal the many ways “pretty pictures” can serve science. From beautiful astrophotos to beginners learning to navigate the night sky to citizen scientists at their computers, a variety of astronomical explorations make for useful scientific endeavors. For instance, the American Association of Variable Star Observers were the first on the scene when Betelgeuse dimmed so drastically last winter. Now, professionals are using their data to determine what happened to the bright red star in Orion. We’re also hunting down the rare R Coronae Borealis stars that periodically fade in nosedives even more drastic than Betelgeuse’s “Great Dimming.” Plus, scientists are rethinking the history of the asteroid belt. These space rocks may not be a collection of failed planets but displaced material from across the solar system.


The Great Dimming of Betelgeuse

Professional and amateur astronomers are working to understand why the famed red supergiant faded so dramatically.

By Tom Calderwood

How Did We Get the Asteroid Belt?

The sparse swath of debris between Mars and Jupiter could tell us about the solar system’s earliest years.

By Nola Taylor Redd

The Ups and Downs of RCB Stars

These intriguing variables are as rare as they are fascinating.

By Greg Bryant

Science with Astrophotography

Your pretty pictures can contain valuable information.

By Richard S. Wright, Jr.

Springtime Blossoms

Vernal skies bloom with planetaries – some are more familiar, while others are more challenging.

By Ted Forte

Beyond the Printed Page:

Arecibo Radio Telescope

Watch the dramatic and heartwrenching collapse of this beloved telescope.

Milky Way Sky Survey

Enjoy this high-resolution hydrogen-alpha map of the sky.

Citizen Science

Participate in research projects across the globe from home with your computer.

Observing Resource: ClearDarkSky

Check the astronomical seeing conditions in your area before venturing out to observe.


Gemini’s Like and Unlike Twins

Castor and Pollux share many similarities, but both stars are unique.

By Fred Schaaf

Vesta Reaches Opposition

The solar system’s brightest asteroid is at its best as it loops through Leo.

By Bob King

Seeing for Planetary Observers

Knowing how Earth’s atmosphere functions can improve your chances of experiencing good planetary views.

By Thomas A. Dobbins

All Around the Beehive

Don’t bypass Cancer, a seemingly shy constellation trying hard not to be seen.

By Ken Hewitt-White

Table of Contents

See what else March's issue has to offer.


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