Why are astronauts younger when they return?
Why are astronauts younger when they return? So depending on our position and speed, time can appear to move faster or slower to us relative to others in a different part of space-time. And for astronauts on the International Space Station, that means they get to age just a tiny bit slower than people on Earth. That's because of time-dilation effects.
How much is 1 year in space on Earth?
Time Dilation and Interstellar Space Flight That is, the spacecraft's clock would display less elapsed time than the clocks back on Earth. For extremely high speeds during a journey, the effect would be more dramatic. For example, one year of interstellar travel might correspond to ten years back on Earth.
Is 1 hour on Earth 7 years in space?
The time dilation on that planet—one hour equals 7 Earth years—seems extreme. To get that, you'd apparently need to be at the event horizon of a black hole. Yes. You can calculate where you must be to have that level of time dilation, and it's extreme.