Astronomy

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Vol. 43

• Issue 12

The world’s best-selling astronomy magazine

THE

IMMENSITY

OF THE

COSMOS

DECEMBER 2015

Travel through the whole universe in 30 pages!

EXTRA!

THE COSMOS TO SCALE

SPECIAL

ISSUE

p. 20

-^ Gas, ice, and rocks in the solar system p. 24
-^ The Milky Way’s barred spiral p. 30
-^ Gravitational supremacy in the Local Group p. 44
-^ The Virgo Supercluster of galaxies p. 50
-^ To the limits of the universe! p. 56

PLUS!

BONUS

ONLINE

CONTENT

CODE p. 4