identify four historical developments in the period 1450-1750. rank them according to how significant they were in either 1 maintaining continuity or 2 bringing about change

Select the correct answer. what was edwin hubble's contribution to the field of astronomy? a. he discovered variable stars. b. he proved that the heliocentric model accurately described our solar system. c. he found a relationship between the period luminosity and distance of stars. d. he proved that the universe is finite. e. he discovered that the universe was expanding.