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Clocking the speed of dark

The speed of light — a brisk 299,792 kilometers per second — is one of the universe’s most fundamental (and scientifically useful) constants.

But relatively little attention has been paid to the speed of light’s nefarious twin, dark.

This week, as part of its excellent Giz Asks series, Gizmodo looked to a number of physicists and experts — including Neil DeGrasse Tyson, George Musser, and Perimeter’s own Niayesh Afshordi — with a seemingly simple question: what’s the speed of dark?

“I believe the speed of dark is infinite!” says Afshordi.

Read his explanation and the others in the full article on Gizmodo.



Perimeter Associate Faculty member Matthew Johnson and his colleagues are working to bring the multiverse hypothesis, which to some sounds like a fanciful tale, firmly into the realm of testable science.

/November 21, 2014

We all intuitively perceive that time flows in only one direction – from past to future – and Templeton Frontiers Fellow Flavio Mercati is developing an innovative point of view on this so-called arrow of time.

/January 16, 2014

Perimeter researchers Flavio Mercati, Elliot Nelson, and Niayesh Afshordi have won first and third places in the second annual Buchalter Cosmology Prize competition. 

/March 18, 2016