Astronomy

BLACK

HOLES

HOW THEY EXPAND

Einstein’s

theories p. 20

JULY 2018

EXPLORING

moons and planets

with submarines p. 44

DISCOVER

deep-sky gems

in Cygnus p. 54

MUST SEE! The year’s best meteor shower p. 32

http://www.Astronomy.com

Vol. 46

• Issue 7

The world’s best-selling astronomy magazine

BOB BERMAN on the Super Moon p. 12

TESTED: Sigma’s new 20mm lens p. 60

NEW RESEARCH

BONUS

ONLINE

CONTENT

CODE p. 4

BONUS

ONLINE

CONTENT

CODE p. 4