William Pickering discovered Phoebe, a moon of Saturn, in March 1899, based on photographic plates from August 1898. Phoebe's discovery marked the first instance of a moon being discovered ...
In October 1923, Edwin Hubble utilized the 100-inch Hooker telescope to photograph the Andromeda Nebula, identifying a variable star within it. Hubble applied the known period-luminosity relationship ...
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