What did Edwin Hubble observe in 1929?

Question

The Universe contracts.

The Universe expands.

The Universe is static.

All Galaxies Move Away from us.

Answer 1

The Universe expands due to dark energy.

Redshift Distance Law of Galaxies (Hubble's law) - consistent with the solutions of Einstein’s General Relativity for  homogeneous, isotropic expanding space.

Some explanation is at Einstein's Law and the Einstein's constant.

Answer 2

Combining measurements of galaxy distances with previous measurements of the redshifts associated with galaxies, Hubble and Milton Humason discovered a rough proportionality of the objects' distances with their redshifts.

In 1929 Hubble and Humason formulated the Redshift Distance Law of galaxies, now called Hubble's law - consistent with the solutions of Einstein’s equations of general relativity for a homogeneous, isotropic expanding space.

So while Hubble would probably choose the 4th option (which is not completely correct, since not ALL galaxies are moving away from us), the closer answer would be the 2nd option.

Answer 3

The Universe expands, based on his findings of the red shift spedometer