The Angry UFOlogist

Our Antimatter, Mirrored, Time-Reversed Universe

Thanks! Share it with your friends!


You disliked this video. Thanks for the feedback!

Sorry, only registred users can create playlists.



Check out the new Space Time Merch Store!

Support Space Time on Patreon

The foundations of quantum theory rests on its symmetries. For example, it should be impossible to distinguish our universe from one that is that is the perfect mirror opposite in charge, handedness, and the direction of time. But one by one these symmetries were found to be broken, threatening to break all of physics along with them.

Tweet at us! @pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit:

Help translate our videos!

Previous Episode: Why String Theory Is Wrong

Hosted by Matt O'Dowd
Written by Matt O'Dowd
Graphics by Luke Maroldi
Assistant Editing and Sound Design by Linda Huang

In his famous lectures on physics, Richard Feynman talks about what it means to expect the universe to be identical in the mirror. For it to be parity-symmetric. He invites us to imagine a clock in a mirror reflection – numbers are backwards, components are all flipped left to right, and it ticks counterclockwise. And then we imagine building that mirror clock in reality. Everything is constructed as though reflected. Numbers get painted backwards. Every screw with right-handed thread or right-spiraling coil is replaced with a left-handed version. Our intuition tells us that the mirror clock should tick in exactly the same way, except counter-clockwise. Our intuition would be wrong.

Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters:

Big Bang

Anton Lifshits
David Nicklas
Fabrice Eap
Juan Benet


Dean Fuqua
James Flowers
Mark Rosenthal
Tambe Barsbay
Vinnie Falco


Chuck Zegar
Danton Spivey
Donal Botkin
Edmund Fokschaner
Jens Theisen
John Hofmann
Jordan Young
Joseph Salomone
Mark Heising
Matthew O’Connor

Thanks to our Patreon Gamma Ray Burst Supporters:

Alexey Eromenko
Antonio Ruiz
Bradley Jenkins
Brandon Labonte
Carlo Mogavero
Daniel Lyons
David Behtala
David Crane
David Schmidt
Dustan Jones
Geoffrey Short
Greg Weiss
Jack Frosch
James Hughes
James Quintero
Jinal Doshi
JJ Bagnell
John Webber
Jon Folks
Joseph Emison
Josh Thomas
Kenneth F Leonard
Kevin Warne
Kyle Hofer
Malte Ubl
Mark Vasile
Nathan Hitchings
Nicholas Rose
Nick Virtue
Richard Broman
Sammy J
Scott Gossett
Sigurd Ruud Frivik
Tommy Mogensen
سلطان الخليفي

Post your comment