Sky & Telescope - January 2025 - 2

CONTENTS
THE ESSENTIAL GUIDE TO ASTRONOMY
FEATURES
Cover Story:
12 Life in a Galaxy Cluster
Collections of galaxies might look
serene through your telescope, but
those groups and clusters are
rollicking places.
By Chris Mihos
20 Auriga Has It All
This easily recognizable constellation
harbors a smorgasbord of
delights. By Scott Harrington
26 Upcoming Solar Eclipses:
2025 to 2035
Here's your guide to when and
where to watch the Moon cross in
front of the Sun. By Joe Rao
34 Odd Radio Circles
When astronomers discovered
monstrous rings in the radio sky,
they began a journey to uncover
the objects' origins.
By Monica Young
60 Pixel Scale for Deep-Sky
Imaging
Here's how you can get all the fine
details your gear can deliver.
By Ron Brecher
January 2025
VOL. 149, NO. 1
60
OBSERVING
41 January's Sky at a Glance
By Diana Hannikainen
42 Lunar Almanac & Northern
Hemisphere Sky Chart
43 Binocular Highlight
By Mathew Wedel
44 Southern Hemisphere
Sky Chart
45 Stories in the Stars
By Stephen James O'Meara
46 Sun, Moon & Planets
By Gary Seronik
48 Celestial Calendar
By Bob King
52 Exploring the Solar System
By Thomas A. Dobbins
54 Planetary Almanac
55 Suburban Stargazer
By Ken Hewitt-White
57 Pro-Am Conjunction
By Diana Hannikainen
ON THE COVER
ONLINE
TIPS FOR BEGINNERS
New to astronomy? Find advice, free
resources, and ways to grow your
interest into a lifelong passion.
skyandtelescope.org/
letsgo
The Hickson Compact
Group 40, in Hydra.
Northeast is up.
PHOTO: NASA / ESA / STSCI /
ALYSSA PAGAN (STSCI)
2
OBSERVAR EL CIELO
Check out our Spanish guides for
getting started in the hobby of
astronomy
skyandtelescope.org/
observar
DIGITAL EDITION
Use the email connected to
your subscription to read
our latest digital edition.
skyandtelescope.org/
digital
SKY & TELESCOPE (ISSN 0037-6604) is published monthly by AAS Sky Publishing, LLC, owned by the American Astronomical Society, 1667 K Street NW, Suite 800, Washington, DC
20006, USA. Phone: 800-253-0245 (customer service/subscriptions), 617-500-6793 (all other calls). Website: skyandtelescope.org. Store website: shopatsky.com. ©2025 AAS Sky
Publishing, LLC. All rights reserved. Periodicals postage paid at Washington, DC, and at additional mailing offices. Canada Post Publications Mail sales agreement #40029823. Canadian
return address: 2744 Edna St., Windsor, ON, Canada N8Y 1V2. Canadian GST Reg. #R128921855. POSTMASTER: Send address changes to Sky & Telescope, PO Box 219, Lincolnshire,
IL, 60069-9806. Printed in the USA. Sky & Telescope maintains a strict policy of editorial independence from the AAS and its research publications in reporting on astronomy.
JANUARY 2025 * SKY & TELESCOPE
MARCH 2018 * SKY & TELESCOPE
S&T TEST REPORT
66 Celestron's Origin Astrograph
By Dennis di Cicco
COLUMNS / DEPARTMENTS
4 Spectrum
By Peter Tyson
6 From Our Readers
7 75, 50 & 25 Years Ago
By Roger W. Sinnott
8 News Notes
70 New Product Showcase
72 Astronomer's Workbench
By Jerry Oltion
74 Beginner's Space
By Diana Hannikainen
76 Gallery
83 Event Calendar
84 Focal Point
By Steve Mazlin
RON BRECHER

http://www.skyandtelescope.org/letsgo http://www.skyandtelescope.org/observar http://www.skyandtelescope.org/digital http://www.skyandtelescope.org/letsgo http://www.skyandtelescope.org/observar http://www.skyandtelescope.org/digital http://www.skyandtelescope.org http://www.shopatsky.com

Sky & Telescope - January 2025

Table of Contents for the Digital Edition of Sky & Telescope - January 2025