Archive for the ‘Percival Lowell’ tag

Pluto, Planet Nine and Other Backyard Worlds

By February 15th, 2017 at 7:02 pm | Comment

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 the best tool he had for finding the faint, moving dot he was seeking, a new planet in our solar system.

When Tombaugh discovered Pluto in those photographic plates on February 18, 1930, the news made headlines all around the globe. “In the little cluster of orbs which scampers across the sidereal abyss under the name of the solar system there are, be it known, nine instead of a mere eight, worlds,” said the New York Times. It was a victory for Tombaugh, and for astronomy. Read the rest of this entry »