Timeline for Is the age of the universe different for a returning space traveller?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 1, 2017 at 3:18 | comment | added | Thriveth | But that would mean the astronaut had aged less, not the surrounding Universe, which has not moved along with the astronaut. | |
| Mar 1, 2017 at 0:36 | comment | added | Dhruv Saxena | While they'd both agree on the "state" that the universe would be in, the disagreement will be on the measurements done in their distinct reference frames. The reasons being: the velocity with which the travel had to be undertaken to get that far and the effects of gravity, owing to the proximity to a black hole. So, even though the astronaut's clock would start ticking like an earth based clock post his return, it just wouldn't have registered as many ticks when traveling at high speeds or being positioned close to a black hole. | |
| Mar 1, 2017 at 0:09 | comment | added | Paul | I don't think this is correct: "Assuming that he returns back to the earth's reference frame after a few billion earth years... his calculations would show that the universe hasn't aged as much as it has for the then residents of earth.". If you can calculate the age of the universe by counting the number of observable galaxies, then they both must agree on the age of the universe at the start and end of his journey. They therefore must agree on how much the universe has aged. | |
| Feb 28, 2017 at 22:01 | history | answered | Dhruv Saxena | CC BY-SA 3.0 |