Speed of light or even approaching it, for instance, is the classic example.
I used Einstein's theory of relativity because it was initially approached with skepticism by the scientific community.
And yes, you're right. Time isn't changed as it's just different compared to someone else based on space or velocity.
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futurism.com]
This is a decent article about bending space. It addresses time travel via speed of light as something possible, but from physicists I've listened to, that is NOT possible, theoretically or otherwise. But hell, some scientists recently discovered how to manipulate atoms via magnetism instead of electricity, which everyone thought was impossible.
