relativity

The galaxy is many things. It is very large. It is very confusing. And it may also be an enormous, confusing but maybe navigable
The surprising answer is: nobody knows. Physicists, despite trying for almost a century to rule it out, have so far failed. The known laws of physics do not forbid time travel. In fact, they appear to make it easy - at least in principle.
The speed of light in a vacuum -- 299,792,458 metres per second - is one of the fundamental principles and outcomes of the
Despite being over 100 years old, Einstein's theory of relativity is still inspiring advances in astronomy. The latest breakthrough
An experiment spanning 7,000 light years of space has proved once again that Einstein got it right, relatively speaking. Scientists