Arrow of Time — Topic Summaries
AI-powered summaries of 14 videos about Arrow of Time.
14 summaries
The Most Misunderstood Concept in Physics
Earth receives a steady stream of energy from the sun, but the deeper mystery is what that energy *doesn’t* do: it doesn’t simply vanish, and it...
3 Important Questions No One Knows The Answers To (Universe Edition)
The central takeaway is that some of the universe’s most basic “why” questions—what time is, what gravity is, and how anything comes from...
Why Doesn't Time Flow Backwards? (Big Picture Ep. 1/5)
Physics at the microscopic level treats past and future symmetrically: equations like F=ma, gravity’s inverse-square law, and Schrödinger’s equation...
How Quantum Entanglement Creates Entropy
Entropy sits at the center of physics’ most stubborn puzzles—why time seems to flow one way, why macroscopic laws look so inevitable, and how black...
The Supernova At The End of Time
A new theoretical path to the far future suggests some “iron stars” may end not in quiet cooling but in a final, rare supernova—an explosion type...
Why Do You Remember The Past But Not The Future?
Physics treats time as directionless: the equations governing motion run just as well backward as forward. Yet human experience is sharply...
Do Cause and Effect Really Exist? (Big Picture Ep. 2/5)
Cause and effect feel natural in everyday life, but at the microscopic level physics treats them as a matter of pattern, not direction. The core...
The Arrow of Time and How to Reverse It
Physics treats time as directionless: reversing every particle’s motion and rerunning the governing equations predicts the same kind of “rewind”...
Breakthrough on 125 Year-Old Physics Problem
A new mathematical result is closing in on David Hilbert’s long-standing demand for an axiomatic foundation of physics by deriving macroscopic fluid...
Good news for faster-than-light travel. Bad news for time travel.
Time travel through a wormhole-like “time loop” runs into a quantum-level constraint: the only consistent past-return scenario requires the system to...
These physicists think we're totally wrong about entropy
A new line of argument attacks the usual status of the second law of thermodynamics by tying it to the “Boltzmann brain” problem—an unsettling...
The Nature of Space and Time AMA
Space and time remain fundamentally mysterious, but the most concrete thread running through the discussion is that modern physics treats them as a...
The Top 10 Physics Paradoxes and Unsolved Problems
The most striking through-line across these ten physics paradoxes is that today’s best theories often predict outcomes that feel conceptually “wrong”...
2022 Year End AMA
The core throughline of PBS Space Time’s 2022 year-end AMA is that “time” and “reality” look different depending on how information is...