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TOP 10
Overlooked Telescope Targets
p. 66
THE ESSENTIAL GUIDE TO ASTRONOMY
Amateur Science:
Humans vs. Robots
p. 38
APRIL
APRIL 2013
APRIL 2013
2013
Exploring
Caves
Where
astronauts
will live
p.18
Space
in
The Great Comet
That Wasn’t
p. 32
An Imager’s
Messier
Marathon
p. 72
Liquid-Mirror
Telescope
p. 26
Visit SkyandTelescope.com
D
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See the Delos series, S&T Hot Product 2013, at the Northeast Astronomy Forum April 20 & 21
Every Tele Vue eyepiece has an
image to live up to. Looks like Delos succeeded.
Tele Vue has many awards for our eyepiece innovations over thirty years. Our new Delos line, with 20mm eye-relief
and 72
°
field of view has just added a couple more! Sky & Telescope found that, like all Tele Vue eyepieces, they
perform “...even better than you imagined.” S&T writes, “Essentially perfect optics. The view is very pure. When it
comes to eyepiece design, the Delos seems to have hit all the sweet spots.” Astronomy agrees, awarding Delos a 2012
Star Product. “Tele Vue has constructed an eyepiece that stands with the best deep-sky and planetary eyepieces on
the market.” Tele Vue eyepieces do it all, with quality and performance to last a lifetime—guaranteed. And when
owning the best doesn’t cost much more, Tele Vue is the easy choice. Try a Delos and discover “love at first light.”
See us at the:
NEAF
NORTHEAST
ASTRONOMY
FORUM
22
nd
Annual
Tele Vue
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32 Elkay Drive, Chester, New York 10918 845.469.4551 www.TeleVue.com
Suffern, NY • April 20-21
See us at the:
NEAF
NORTHEAST
ASTRONOMY
FORUM
22
nd
Annual
Suffern, NY • April 20-21
April 2013
VOL. 125, NO. 4
On the cover:
Caves will be the
safest places for
early colonists
to live in space’s
hazardous
environments.
OBSERVING APRIL
43
In This Section
44
April’s Sky at a Glance
45
Binocular Highlight
By Gary Seronik
46
Planetary Almanac
There’s more to find online @
SkyandTelescope.com
S&T
: PATRICIA
GILLIS-COPPOLA
47
Northern Hemisphere’s Sky
By Fred Schaaf
48
Sun, Moon & Planets
FEATURES
18
Exploring Caves on Other Worlds
SKY AT A GLANCE
Our popular column highlights
celestial delights for the upcom-
ing week. Also available as an
app — with sky charts included!
SkyandTelescope.com/ataglance
Future colonists on the Moon and Mars
By Fred Schaaf
COVER
STORY
will initially live in caves. That’s why
50
Celestial Calendar
scientists today are on the lookout for
By Alan MacRobert
underground passages.
By Robert Zimmerman
54
Exploring the Moon
By Charles Wood
26
Liquid Astronomy
56
Deep-Sky Wonders
The Large Zenith Telescope’s mercury
By Sue French
mirror provides critical insights for next-
gen instruments.
S&T TEST REPORT
60
S&T Test Report
By Eagle Gamma
By Dennis di Cicco
32
Remembering Comet Kohoutek
“The Comet of the Century” proved
ALSO IN THIS ISSUE
to be anything but.
6
Spectrum
By Dean Regas
SKY
WEEK
By Robert Naeye
38
The Future of Amateur Science
8
Letters
In a roboscope-dominated future, backyard
NASA / HUBBLE HERITAGE TEAM / STSCI / AURA
9
75, 50 & 25 Years Ago
observers will still play an important role
FIND PRODUCTS & SERVICES
Our easy-to-use directory will
help you fi nd what you need.
SkyandTelescope.com/directory
By Roger W. Sinnott
in astronomical research.
By Pamela Gay
10
News Notes
66
Top 10 Neglected
16
Cosmic Relief
Deep-Sky Wonders
By David Grinspoon
ASTROPHOTO GALLERY
Enjoy readers’ best images
and upload your own.
SkyandTelescope.com/gallery
Hidden in plain sight, why aren’t
42
New Product Showcase
these familiar old favorites?
By James Mullaney
64
Telescope Workshop
By Gary Seronik
72
Imaging the Messier Marathon
77
Gallery
TIPS FOR BEGINNERS
New to astronomy? Here’s
everything you need to jump
into the fun.
SkyandTelescope.com/letsgo
Two telescopes, 110 targets, and
one night to shoot them all.
86
Focal Point
By Alex McConahay
By David A. Kantorowitz
SKY & TELESCOPE
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4
April 2013
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DESIGNED FROM THE
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Engineered with imaging in mind,
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Learn more about the Advanced VX mount and
available optical tubes in the Advanced VX series
by scanning the QR code with your smart phone
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See us at the:
NEAF
NORTHEAST
ASTRONOMY
FORUM
22
nd
Annual
CELESTRON PREMIER SELECT DEALERS
OPT Telescopes – 800.483.6287 – www.opttelescopes.com
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Astronomics – 800.422.7876 – www.astronomics.com
Adorama – 800.223.2500 – www.adorama.com
High Point Scientific – 800.266.9590 – www.highpointscientific.com
Optics Planet – 800.504.5897 – www.opticsplanet.com
Telescopes.com – 888.988.9876 – www.telescopes.com
Focus Camera – 800.221.0828 – www.focuscamera.com
Woodland Hills – 888.427.8766 – www.telescopes.net
Suffern, NY • April 20-21
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