The Spacetime Emporium website will be unavailable Friday evening through Saturday afternoon as electrical work occurs in the American Center of Physics server room. Down time will begin at 6PM Eastern Time on Friday. Service is expected to resume by 6PM on Saturday, July 30.

Featured Image Archive

Ejs Einstein’s Train and Tunnel Model - Jan 18, 2013

The Einstein's Train and Tunnel model displays the standard special relativity experiment of a train in a tunnel seen from two different reference frames.

Gravitational Wave Activities - Oct 21, 2012

Student Activities for studying gravitational waves.

Einstein Online - Sep 22, 2012

Einstein Online provides a careful explanation of Einstein's Theory of Relativity, from the concepts of Spacetime and Space Geometry to modern topics such as Gravitational Waves, Black Holes and Cosmology, and relativity in the Quantum realm.

Einstein Light - Apr 1, 2010

This web site provides a basic, non-mathematical introduction to relativity with a range of multimedia illustrations.