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Block Universe — Topic Summaries

AI-powered summaries of 5 videos about Block Universe.

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Do the Past and Future Exist?

PBS Space Time · 3 min read

The past and future may not be “gone” and “blank” in the way everyday language suggests. Instead, physics—especially relativity—undermines the idea...

Block UniverseRelativityLight Cones

Is The Future Predetermined By Quantum Mechanics?

PBS Space Time · 3 min read

Quantum mechanics and relativity collide on a single question: does the universe leave room for an open future, or does the future already sit fixed...

Block UniverseQuantum InterpretationsWave Function Collapse

The Andromeda Paradox Even Confuses Physicists

Sabine Hossenfelder · 2 min read

The Andromeda paradox is a relativity puzzle about how “now” and simultaneity work when two observers move relative to each other—so much so that...

Andromeda ParadoxRelativity of SimultaneitySpacetime Diagrams

The Arrow of Time and How to Reverse It

PBS Space Time · 2 min read

Physics treats time as directionless: reversing every particle’s motion and rerunning the governing equations predicts the same kind of “rewind”...

Arrow of TimeEntropyThermodynamics

This is why I believe that the future already exists

Sabine Hossenfelder · 3 min read

Einstein’s relativity implies that past, present, and future aren’t stacked one after another—they’re all part of a single, unchanging...

Block UniverseRelativitySimultaneity