July 1981

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The world's best-selling astronomy magazine offers you the most exciting, visually stunning, and timely coverage of the heavens above. Each monthly issue includes expert science reporting, vivid color photography, complete sky coverage, spot-on observing tips, informative telescope reviews, and much more! All this in an easy-to-understand, user-friendly style that's perfect for astronomers at any level.

Features

Mars: 5 Years after Viking

pg. 6

Gravity Lenses: A Focus on the Cosmic Twins

By Emilio Falco, Nathaniel Cohen

pg. 18

Forum

- Come Explore a Comet - Bruce Murray on the Future of America in Space

pg. 24

Eye on the Sky

By Fred Schaaf

The Great Conjunction: Act III

pg. 30

In Focus

pg. 36

Behind the Scenes

pg. 37

Equipment Atlas

By Ben Mayer

The Electronic Sky

pg. 38

Gazer's Gazette

July's Lunar and Solar Eclipses

pg. 47

AstroNews

pg. 56

Astronomy Reviews

pg. 62

Stellar Frontiers

By Barry Parker

The Age of the Universe

pg. 66

AstroMart

pg. 72

Through the Eyepiece

Close-up on Ophiuchus

pg. 78

	Sun	Sun	Moon
RISE	—		—	PHASE	—
SET	—		—	DISK	—

	Mercury	Mercury	Venus	Venus
RISE	—		—
SET	—		—
		—		—

	Mars	Mars	Jupiter	Jupiter	Saturn	Saturn
RISE	—		—		—
SET	—		—		—
		—		—		—