Thanks to GPS, planes, cars and cellphones can quickly be guided to any destination. The system uses a network of satellites, but how do they relay the correct coordinates from space?
In our latest One-Minute Physics episode, animator Henry Reich explains why GPS is just a big clock in space. By communicating with four time-keeping satellites, a GPS device can determine it's exact position - but that's after it corrects for the effects of general relativity.
If you enjoyed this video, check out the rest of our One-Minute Physics series. You can find out how to break the speed of light in your backyard or see how a particle can also be a wave.
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