NASA has to start protecting planets better. The international treaty governing space—there is one—and the laws and regulations that follow it date back to the Cold War. That was before scientists knew about the oceans on moons around other planets, before they knew about how tough microorganisms get here on Earth (and so maybe in space too?), before they started planning experiments to look for life on Mars, and before tech billionaires started threatening to send people to space.

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