Step 1 : Introduction to the question "2. This influential American astronomer devised a classification system for galaxies. He also discovered the relationship between a galaxy's distance from Earth and its speed relative to it, thereby establishing that the universe is expanding. Who was he?"
...1. Harlow Shapley 2. G�rard de Vaucouleurs 3. Edwin Hubble 4. George Ogden Abell Edwin Hubble, a Missouri native, was born in 1889 and he joined the staff at Mount Wilson Observatory in 1919. His main contribution to astronomy is the discovery that some "nebulae" are really galaxies beyond the Milky Way and that the universe as a whole is expanding. The Hubble Space Telescope, launched in 1990, was named in his honor. -StetsonHat
Step 2 : Answer to the question "2. This influential American astronomer devised a classification system for galaxies. He also discovered the relationship between a galaxy's distance from Earth and its speed relative to it, thereby establishing that the universe is expanding. Who was he?"
Edwin Hubble:
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