What Actually Expands In An Expanding Universe

As the universe expands, ,expanding, space is said to stretch photons. But if it stretches photons, does it also stretch molecules, galaxies and you A portion of this video was sponsored by Salesforce. Go to to learn more. Special thanks to Geraint Lewis this video was based on his paper On the relativity of redshifts Check out his YouTube channel: and books: References: Expanding Space: the Root of all Evil Matthew J. Francis, Luke A. Barnes, J. Berian James, Geraint F. Lewis Editing and VFX by Trenton Oliver Thumbnail by Ignat Berbeci Music from , SMB, smallbiz, startups, SalesforceEssentials