His observations of Cepheid variables in what was then called the Andromeda Nebula demonstrated that that object was too distant to lie within the Milky Way; in addition to suggesting that other galaxies must exist, he introduced a method to classify them featuring a diagram often displayed like a (*) tuning fork. His most prominent contribution arose out of work with Milton Humason, though the constant of proportionality was originally over seven times higher than its present value. For 10 points, name this astronomer who in his namesake law gives recession velocity as about seventy kilometers per second per megaparsec times distance.
His observations of Cepheid variables in what was then called the Andromeda Nebula demonstrated that that object was too distant to lie within the Milky Way; in addition to suggesting that other galaxies must exist, he introduced a method to classify them featuring a diagram often displayed like a (*) tuning fork. His most prominent contribution arose out of work with Milton Humason, though the constant of proportionality was originally over seven times higher than its present value. For 10 points, name this astronomer who in his namesake law gives recession velocity as about seventy kilometers per second per megaparsec times distance.
His observations of Cepheid variables in what was then called the Andromeda Nebula demonstrated that that object was too distant to lie within the Milky Way; in addition to suggesting that other galaxies must exist, he introduced a method to classify them featuring a diagram often displayed like a (*) tuning fork.
Edwin Powell {Hubble}