Timeline for Born on the same day, but one is two years older
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 25, 2018 at 9:38 | comment | added | workoverflow | @DanielBeck Welcome to puzzling.SE, where we compete with WorldBuilding.SE to create spherical, frictionless babies. | |
| Mar 24, 2018 at 8:21 | comment | added | Todd Wilcox | A better solution that uses GR might be that there is a steep gravity gradient nearby and one baby is in a much stronger gravitational field than the other. That solves the problem of acceleration time. Infalling blue-shifted radiation is a possible concern, as are tidal forces if the source of the gradient is very small, so it would have to be big. A large neutron star might be the best thing. A neutron star also would not emit dangerous Hawking radiation (IIUC) which gives it an advantage over a black hole. | |
| Mar 22, 2018 at 23:39 | comment | added | Daniel Beck | I joined this site solely so I could upvote the phrase "a spherical, frictionless baby" | |
| Mar 22, 2018 at 20:18 | comment | added | An old man in the sea. | @aschepler you're right. Didn't see that. ;) | |
| Mar 22, 2018 at 12:04 | comment | added | aschepler | @Anoldmaninthesea. Except the puzzle says "is", present tense. The travel would have to happen pretty soon after birth. | |
| Mar 22, 2018 at 7:38 | comment | added | N. Virgo | If the spaceship went all the way around the galaxy then the one who stayed on Earth would be hundreds of thousands of years older, not just two! It's better to say they went about a quarter of the way to the nearest star. (That's 4.2 light years away, so if you go a quarter of the way there and back again, that's about a 2 light year journey.) | |
| Mar 22, 2018 at 5:52 | comment | added | Challenger5 | @DarrenH Maybe on WorldBuilding.SE... | |
| Mar 22, 2018 at 4:10 | comment | added | Mr Pie | I bookmarked this question just to look back at this answer :D | |
| Mar 21, 2018 at 18:04 | comment | added | An old man in the sea. | @Bass for a civilization to have a spaceship that can go around a galaxy at ultra-high speed, they can have the tech to protect the baby... Also, if we just want to assume as much as we like, the travelling could have been done after the children grew up. You're not stating in the OP that they had a 2 year gap all their lives... | |
| Mar 21, 2018 at 16:50 | comment | added | Darren H | "...a spherical frictionless baby..." only on puzzling.SE would one expect such a phrase | |
| Mar 21, 2018 at 16:18 | comment | added | Bass | Since days are no doubt calculated in Earth's reference frame, and we can assume that even a spherical, frictionless baby would malfunction if subjected to constant acceleration exceeding 20g, it would take almost three weeks to accelerate an initially stationary baby to the required speed. Therefore this answer is slightly inaccurate, and the other baby must have been born on the already relativistic spaceship. | |
| Mar 21, 2018 at 11:28 | comment | added | Malkev | youngest astronaut alive | |
| Mar 21, 2018 at 10:03 | comment | added | user21469 | this can be the only correct answer | |
| Mar 21, 2018 at 8:09 | history | answered | Ari | CC BY-SA 3.0 |