Thank you for the responses. I have a follow-up question, though I recognize that it probably has to do with my lack of understanding of Einstein's relativity so it may not be easy to explain to me.
In this hypothetical where there are 2 Earths, and Earth 2 moves at a speed near the speed of...
Putting all practical implications aside, I was thinking about the idea of another planet that travels around the sun faster than Earth. I know that some planets do, but let's say that some day in the future we were able to create another planet, called Earth 2, that traveled around the Sun at a...