Astronomy (USA) 2020-04.pdf

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APRIL 2020
VOL. 48, NO. 4
ON THE COVER
CONTENTS
FEATURES
18
Jim Lovell remembers:
Triumph over tragedy
The famous astronaut recounts
Apollo 13 — the mission that
almost didn’t make it home.
RICHARD TALCOTT
Midway to the Moon, an oxygen
tank explosion crippled Apollo 13,
which, thankfully, was able to make
the return trip to Earth safely.
18
COLUMNS
38
Star Dome and
Paths of the Planets
RICHARD TALCOTT;
ILLUSTRATIONS BY ROEN KELLY
52
Explore the heart
of Virgo
Spring is galaxy season,
and no constellation proves
it better than this one.
MICHAEL E. BAKICH
Strange Universe
16
BOB BERMAN
Secret Sky
62
STEPHEN JAMES O’MEARA
Observing Basics
64
GLENN CHAPLE
44
28
Apollo 13 in 3D
A near-tragedy in space
challenged the crew of
Apollo 13. They missed
walking on the Moon, but
in the end, triumphed.
DAVID J. EICHER AND BRIAN MAY
Ann Druyan on
Cosmos
and Carl Sagan’s legacy
Astronomy’s
editor interviews
the executive producer of
Cosmos
and late, great Carl
Sagan’s widow.
DAVID J. EICHER
Binocular Universe
66
PHIL HARRINGTON
58
The sky’s best
elliptical galaxies
Discover a world of massive
star cities lurking in the
skies of fall and spring.
MICHAEL E. BAKICH
9
QUANTUM GRAVITY
Everything you need to
know about the universe
this month: the first map
of a neutron star, galaxies
missing dark matter, and
Parker Solar Probe news.
50
Visit the nearest 14
habitable exoplanets
From a planet circling Proxima
Centauri to several around
TRAPPIST-1, life-friendly
worlds might be closer than
you think.
JOHN WENZ
36
Sky This Month
Venus slips past two star
clusters.
MARTIN RATCLIFFE
AND ALISTER LING
70
Ask Astro
Expanding space.
IN EVERY ISSUE
From the Editor
6
Astro Letters
8
Advertiser Index
65
New Products
68
Reader Gallery
72
Breakthrough
74
News
The latest
updates from
the science
and the hobby.
Go to
www.Astronomy.com
for info on the biggest news and
observing events, stunning photos,
informative videos, and more.
ONLINE
FAVORITES
Dave’s
Universe
The inside
scoop from
the editor.
Trips and
Tours
Travel the world
with the staff of
Astronomy.
Picture of
the Day
Gorgeous
photos from
our readers.
Astronomy
(ISSN 0091-6358, USPS 531-350)
is published monthly by Kalmbach Media
Co., 21027 Crossroads Circle, P. O. Box 1612,
Waukesha, WI 53187–1612. Periodicals postage
paid at Waukesha, WI, and additional offices.
POSTMASTER: Send address changes to
Astronomy,
PO Box 8520, Big Sandy, TX 75755.
Canada Publication Mail Agreement #40010760.
4
ASTRONOMY
•
APRIL 2020
ASTRONOMY:
ROEN KELLY; MOON: NASA

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