Pluto, Planet Nine and Other Backyard Worlds

By:¬†Marc J. Kuchner Eighty-seven years ago, this week, Clyde Tombaugh was poring over a pair of photographic plates, hoping to change the world.¬† He was staring hard into an arcane device called a blink comparator, which allowed him to rapidly switch from viewing one image to the next. In those days before computers, that was … Read more “Pluto, Planet Nine and Other Backyard Worlds”

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