Question

Why Einstein said that nothing travel faster than speed of light

Answer 1

because it travels 300000km

Answer 2

When Albert Einstein said that nothing travels faster than thespeed of light, he didn't talk about objects that could already betraveling faster than light. This is a mind-boggling idea that some physicists have explored over the years, and they call these hypothetical particles tachyons. Faster-than-light particles, or “tachyons”, may be fundamentally impossible, according to two mathematical physicists. If they’re right, their new theory would also imply that time – seemingly one of the most fundamental facets of nature – is no more than a mirage.

Although it is commonly believed that Einstein’s theory of relativity says nothing can go faster than light, that is not quite true. Relativity does forbid ordinary matter from ever reaching the speed of light, because it would require infinite energy.

But the theory does not rule out a realm of particles that can only travel faster than light. Named “tachyons” by physicists in the 1960s, these subatomic speedsters would actually need an infinite amount of energy to slow down to the crawl of light-speed.

Tachyons crop up as possibilities in several speculative physical theories, such as some versions of string theory. Physicists have searched for their expected signatures. If they are among the high-energy particles that hit Earth from space, tachyons would produce a signal similar to cosmic rays – except that they would reach ground-based detectors ahead of the secondary particles they created in the atmosphere.