What did Edwin Hubble discover?

In Hubble's day, no one was sure how far away these fuzzy spiral nebula were. By photographing these spiral nebula over several months, and studying the differences in the images, Hubble realized he had found several Cepheid variable stars and he could use them as standard candles to determine the distance to these nebula. He found that they were immensely farther away than people thought was possible. Hubble eventually used other standard candles such as Type 1a supernova to tabulate more distance measurements. As Hubble began to compare his distance data to the spectrum of these nebula he found a relationship. That the farther away the object is, the faster away from us it is moving. This is what we now call Hubble's Law (v = H*d) where H = the Hubble constant currently defined to be 71.0 � 2.5 (km/s)/Mpc.