Hard Numbers
Hard number: Lunar sphere of influence
The record number of miles humans have traveled in space.
Natalie Johnson
April 06, 2026
The astronauts of Artemis II – NASA’s Reid Wiseman, Victor Glover, and Christina Koch, along with Jeremy Hansen of the Canadian Space Agency – entered the moon’s sphere of influence today. It is a key milestone in their 10-day mission: Once inside it, the moon’s gravity becomes stronger than Earth’s, helping “slingshot” the crew back home.
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