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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.

30 points to the best/brainliest answer ps. this is an ap human geography question but i didn't know what category to put it inwhat religious and/or political dimensions are attached to the china and tibet conflict? explain