Apparently, there was lively debate prior to it being settle by Lemaître and Hubble. I like the original name of 'island universes' https://physicsworld.com/a/

Apparently, there was lively debate prior to it being settle by Lemaître and Hubble. I like the original name of 'island universes' https://physicsworld.com/a/shapley-curtis-and-the-island-universes-controversy/ https://physicsworld.com/a/shapley-curtis-and-the-island-uni...