TED-Ed

View full lesson: http://ed.ted.com/lessons/the-fundamentals-of-space-time-part-2-andrew-pontzen-and-tom-whyntie View part 1 here: http://ed.ted.com/lessons/the-fundamentals-of-space-time-part-1-andrew-pontzen-and-tom-whyntie Light always travels at a speed of 299,792,458 meters per second. But if you're in motion too, you're going to perceive it as traveling even faster -- which isn't possible! In this second installment of a three-part series on space-time, CERN scientists Andrew Pontzen and Tom Whyntie use a space-time diagram to analyze the sometimes confounding motion of light. Lesson by Andrew Pontzen and Tom Whyntie, animation by Giant Animation.