There is no evidence that X-rays travel faster than light. In fact, all electromagnetic radiation, including X-rays, travels at the speed of light in a vacuum. This is a fundamental principle of physics and has been rigorously tested and confirmed by countless experiments.

It's possible that you might be misremembering or misinterpreting information. The idea that X-rays might travel faster than light is a misconception that has been debunked.

If you can provide more context about where you heard this information, I might be able to help clarify the source of the misunderstanding.