3 ms·
Light and thus causality and information travel at a constant speed of "c." As far as we know, nothing can travel faster than "c" - other than the universe itse
by ianai 4y ago
Light and thus causality and information travel at a constant speed of "c." As far as we know, nothing can travel faster than "c" - other than the universe itself as in during the inflationary epoch. So the further out any observer would look the longer that light would have had to travel relative to that observer. Seeing something 3 billion light years away would mean the light took 3 billion years to arrive at the observer.
- Maursault 4y ago> As far as we know, nothing can travel faster than "c" What Relativity forbids is anything traveling as fast as c, as the increase in mass as c is approached would require infinite energy to reach. Relativity says absolutely nothing about faster than c, i.e. it does not forbid things such as the theoretical tachyon.