Harry takes a space voyage and returns to find his twin sister has aged more than he has. This is evidence that they have been in a different....?
health plan :-)
spcae times
The correct answer is "space-time." When Harry takes a space voyage and returns to find that his twin sister has aged more than he has, it suggests that they have experienced different rates of time passing. This phenomenon is a consequence of Einstein's theory of relativity, which states that time can be affected by factors like gravity or velocity. Traveling at high speeds or being in a region with strong gravitational fields can cause time to pass at different rates for different observers, leading to what is called time dilation.
In this situation, Harry's space voyage likely involved traveling at high speeds or being in an environment with different gravitational forces compared to Earth. As a result, his experience of time would have been different from that of his twin sister, who stayed on Earth. Harry would have experienced time passing more slowly relative to his sister, causing him to age less.
Therefore, the fact that Harry's twin sister has aged more than he has is evidence that they have been in a different space-time, where the effects of relativity have influenced the passage of time for each of them.