Skip Channel4 main Navigation
Ask An Expert: Your Questions & Answers
Q1 | Q2 | Q3 | Q4 | Q5 | Q6 | Q7Question 4
Can anything travel faster than the speed of light?
Prof Pethica: A slightly more complicated question than travelling at the speed of light. For example, the speed of light in a piece of material is generally lower than in vacuum. Therefore if a particle enters a material below vacuum light speed but above light speed in that material,
it has to slow down. The energy it loses doing so appears as Cerenkov radiation. This can be readily observed.
Apart from that, there is no evidence for faster than light travel. Just as important, there is no evidence that information can be sent anywhere faster than light speed.
Apart from that, there is no evidence for faster than light travel. Just as important, there is no evidence that information can be sent anywhere faster than light speed.
Subscribe to C4 Science homepage
