The discovery was made by carefully examining and screwing an enlargement of a photographic plate of Pluto and noticing it had a very slight bulge on one side. By examining images taken over several successive days, he was able to convince himself that it was a moon. The photographic evidence was considered convincing but not conclusive; however, based on the orbit determined, a series of mutual eclipses of Pluto and Charon was predicted and observed, which provided confirmation.
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