What Happens At The Edge Of The Universe? | Space Time | PBS Digital Studios

From a channel Lumen includes in full: PBS Space Time, written and hosted by astrophysicist Matt O'Dowd, works through relativity, quantum mechanics and cosmology at near-undergraduate depth, explaining the actual physics and the current research behind it.

A 10-minute video from PBS Space Time's catalogue; the title names its topic.

Video by PBS Space Time, played through YouTube's embedded player.