One classification system developed by this man distinguishes objects labeled Sa through Sc from those labeled SBa through SBc.
One classification system developed by this man distinguishes objects labeled Sa through Sc from those labeled SBa through SBc. This man resolved the Curtis-Shapley debate by using Cepheid variables to measure the distance to the Andromeda Galaxy. This namesake of a tuning fork diagram for classifying galaxies also names a constant currently estimated at about 70 kilometers per second per megaparsec. That constant is used in a law named for this man, which sets relative velocity proportional to distance and describes the universe's constant expansion. For 10 points, identify this namesake of a space telescope launched by NASA in 1990, an American astronomer.
One classification system developed by this man distinguishes objects labeled Sa through Sc from those labeled SBa through SBc.
Edwin Hubble