1673: "There Is No Universal Now"
From Interesting Things with JC by JC
June 4, 2026 · 3 min · Episode 1673
About this episode
This episode discusses how different observers perceive time and simultaneity in the universe.
Interesting Things with JC #1673: "There Is No Universal Now" – A star 100 light-years away is doing something at this moment, but observers moving at different velocities can assign different times to the same distant event. What appears simultaneous to one observer does not appear simultaneous to another, and the universe continues without a single present moment everyone shares.
People in this episode
Host: JC
Topics covered
- time
- relativity
- observers
- universe
- simultaneity
Keywords
- universal now
- light-years
- velocity
- distant events
- present moment
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