3 ms·
As I've seen this point made in the past, it's that travelling at a constant 1g acceleration the subjective time for an astronaut would be about 45 years in tra
by dredmorbius 3y ago
As I've seen this point made in the past, it's that travelling at a constant 1g acceleration the subjective time for an astronaut would be about 45 years in traversing the observable Universe (~14 billion light years).
That is, a comfortable and familiar acceleration gives a human-lifetime-equivalent journey (subjective time).
If you're planning a round-trip, you'll find rather more time has transpired on what used to be Earth.
<https://www.universetoday.com/129086/far-can-travel/ https://www.universetoday.com/129086/far-can-travel/>
- saalweachter 3y ago> If you're planning a round-trip, you'll find rather more time has transpired on what used to be Earth. Or less, depending on the rotation of the universe as a whole.
- ben_w 3y agoOr no return may be possible at any speed/acceleration given the expansion of the universe.
- dredmorbius 3y agoGiven that the outbound journey is already technically challenging, that's very nearly quibbling, despite cosmological accuracy.
- heavenlyblue 3y agoThat 1g constant acceleration requires practically infinite amounts of energy
- dredmorbius 3y agoTrue. However it is also the specific context in which the lifetime-universe-traversal concept emerges.