Travel, no. Looking, yes. By looking at the Andromeda galaxy you are seeing it as it was 2.5 million years ago. By traveling closer to the Andromeda galaxy it's change would accelerate "forward" in time until you get to it and see it in its near-present state.Mine is a simple question: is retro-time travel possible? — Happenstance
Interesting thought. Makes me think that somewhere, really advanced aliens are sharing snapshots of each others' histories!Travel, no. Looking, yes. By looking at the Andromeda galaxy you are seeing it as it was 2.5 million years ago. By traveling closer to the Andromeda galaxy it's change would accelerate "forward" in time until you get to it and see it in its near-present state. — Harry Hindu
I remember seeing a Red Dwarf episode in which the crew land on an anomalous planet where time travelled backward to the crews', and our point of view. This seemed like it was normal to them and our past is their future and vice-versa!If time is circular, then travelling forward in time would eventually lead to retro-time travel. — Devans99
The thing about the big Crunch though is: would it necessarily be the same set of events going backwards in that the inhabitants from the rebound do the same things as us, or reverse-time as in the Red Dwarf story? — Happenstance
Anyway, did you know that the smart money is on being a big freeze due to dark matter being a constant? If we get a decrease in dark matter then a big crunch is likely and an increase would mean a big rip is more likely! — Happenstance
I agree with this, theoretically speaking.But the Big Rip does not explain the Big Bang in a neat and tidy way like the Big Crunch does. — Devans99
Measurements so far have density equal to the critical density(mass needed to stop the expansion) which should eventually slow the expansion down gradually to a flat, infinite universe. This being contingent on the observable universe being at the range of the entire universeThe only topology that fits this requirement is a closed loop - circular time. — Devans99
Measurements so far have density equal to the critical density(mass needed to stop the expansion) which should eventually slow the expansion down gradually to a flat, infinite universe — Happenstance
Yeah, I must admit that my info is possibly from five years ago. I forget that these telescopes are updated periodically.The expansion rate of the universe has slowed in the past (end of inflation), it could slow again and maybe reverse. I think the astronomers are not too sure on the actual expansion rate: — Devans99
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