A satellite image of a swirling hurricane Men with gas masks and protective suits on The planetary rover Sojourner A large group of refugees huddled together

EXPLORATION

Mars

Archaeology






Long an object of mystery and speculation, Mars is beginning to reveal its secrets. Unmanned probes of the red planet—first begun in the 1970s—are filling in the blanks and blazing a trail for human explorers to follow.
image: Mars
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