APS Logo Kids
Black HoleTrainSunClockE=mc2Radioactivity SymbolTwin ParadoxLight Cone Train

Imagine you are riding on a train when lightning bolts suddenly strike at opposite ends of the train car. Although it seems to you that the bolts strike at the same time, people alongside the track will disagree. Special Relativity explains how the passengers and bystanders can both be right even though they disagree.

Train Tile Train Line Art
Train Kid


Artwork Columns:
Matter | Quantum | Relativity | Einstein's Life

Terms of Use | © 2012 American Physical Society