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




Why do people explore? Scientists theorize that war and hunger were two reasons why early humans were driven to leave their homes. But many also believe they were motivated by simple curiosity: a desire to see what lies beyond the next mountain.

Archaeologists piece together the saga of human expansion across the planet from the long-buried artifacts that they left behind, even as new chapters are being written in the vast expanses of space.

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