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scuzzy987 t1_j6ayyy5 wrote

Reply to comment by JJohnston015 in TIL that in 1930 astronomer Clyde Tombaugh discovered Pluto and in 2007 his ashes were aboard the first spacecraft sent to explore it. by Emu_Enough

I saw a presentation by him on how he discovered Pluto. He said he had two photographs of the same small region of space and flipped them back and forth to find a white dot that moved. He said it was very tedious and he looked at lots of pairs of photographs. He was a very interesting presenter

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JJohnston015 t1_j6azbqn wrote

Yes, he showed us those same 2 pictures. As he flipped the projector back and forth, he pointed out the one that jumped back and forth. That was it.

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