http://www.sciencemag.org/news/2018/10/move-over-hubble-discovery-expanding-cosmos-assigned-little-known-belgian-astronomer

Belgian astronomer Georges Lemaître proposed the idea of an expanding universe 2 years before Edwin Hubble.

Hubble’s Law, a cornerstone of cosmology that describes the expanding universe, should now be called the Hubble-Lemaître Law, following a vote by the members of the International Astronomical Union (IAU), the same organization that revoked Pluto’s status as a planet. The change is designed to redress the historical neglect of Georges Lemaître, a Belgian astronomer and priest who in 1927 discovered the expanding universe—which also suggests a big bang. Lemaître published his ideas 2 years before U.S. astronomer Edwin Hubble described his observations that galaxies farther from the Milky Way recede faster.