Prove it.Frayed Knot said:But it's not just gravity - if your twin brother got onto a spaceship and headed off at great speed in one direction for a few years, then turned around and came back, his clock would show that, for example, only ten years had passed while your clock showed 20 years, and you would have visibly aged by twice as much as him.
When I jumped into this thread recently, I had not ever gone back and read the first post by Pastor Bob from 2006. I did that today, and Bob, from what I gathered, would agree with what I've said here, about clocks, including our biological clocks (our sense of time passing), would be slowed down by traveling that fast. His disagreement seemed to be just a semantic one, about whether we should measure the passage of time by clocks and our rate of aging, or by the Earth's rotation.
So I guess I could tell you that if you disagree with what I had written, you could take it up with Pastor Bob. Instead, I'll just point out that relativity has been tested again and again and again for nearly 100 years, and every time it's been tested, it's exactly right.