Clyde Tombaugh spent much of his life peering at telescope data. He discovered Pluto in 1930, and he spent years poking around the outer solar system. But as the scientific community began to dream about launching a vehicle into the great beyond, he focused his gaze much closer to home. At the time, the smaller stuff in our immediate space environment remained largely a mystery. People like Tombaugh worried whether orbiting gunk would make spaceflight that much harder.

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