To try out our new course (and many others on math and science), go to https://brilliant.org/sabine. You can get started for free, and the first 200 will get 20% off the annual premium subscription.

Albert Einstein taught us that space and time belong together to a common entity: spacetime. This means that time becomes a dimension, similar to space, and has profound consequences for the nature of time. Most importantly it leads to what has been called the block universe, a universe in which all moments of time exist the same way together. The future, the present, and the past are the same, it is just our perception that suggests otherwise.

Sign up for my weekly science newsletter. It's free! ➜ http://sabinehossenfelder.com/
Support me on Patreon ➜   / sabine  
My new book "Existential Physics" is coming out in August ➜ http://existentialphysics.com/

0:00 Intro
00:58 Spacetime
02:09 Spacetime diagrams
03:40 Special Relativity
05:05 The Relativity of Simultaneity
10:36 The Block Universe
12:46 The if's and but's
14:50 Sponsor Message