3 ms·

You never reach that limit if you are accelerating with a normal engine at 1g. You will get closer and closer to it, but never reach it. If you somehow DO achi

You never reach that limit if you are accelerating with a normal engine at 1g. You will get closer and closer to it, but never reach it. If you somehow DO achieve lightspeed, time stops for you, completely, so from your point of view you are teleporting, but since time is stopped no machine or chemical reaction can happen, thus why we believe lightspeed machinery is impossible. By the way, achieving near lightspeed with 1g acceleration is in a way, hard, for example the trip to alpha centauri at 1g results in you achieving "only" 94% of light speed... to do that same trip peaking at 99.0% of light speed it would take 3g of acceleration, and it would result in the trip being roughly 1/3 shorter (taking 1.7 years more or less, instead of 5)

SketchySeaBeast 6y ago
> Crazy things happen if you decide to go on galaxy-wide trips though, to the astronauts because space contraction they perceive their own trip as happening still rather quick, a 100 000 ly trip (the size of our galaxy, for reference) takes 22 years for someone inside a spaceship with 1g acceleration, perfectly doable. But people outside still see it taking 100 000 years... (meaning they will be 100 000 years "older" from the point of view of the astronauts) But from your frame of reference wouldn't you be moving much faster than the speed of light? If you're taking 22 years to travel 10,000 ly, that means you're moving faster than light in your perception, doesn't it? Isn't that forbidden in any frame of reference?
- simiones 6y ago
  From your frame of reference, the universe is much smaller in the direction of travel. You'd still see light zoom past you at 1c, though.
- zaarn 6y ago
  From your perspective, the entire length of the milky way is squished into 22 light years (roughly), so not really violating anything. From the outside frame of reference you still take 10000 years (plus) to cross that distance, from your perspective, the distance gets shorter.

SketchySeaBeast 6y ago

> Crazy things happen if you decide to go on galaxy-wide trips though, to the astronauts because space contraction they perceive their own trip as happening still rather quick, a 100 000 ly trip (the size of our galaxy, for reference) takes 22 years for someone inside a spaceship with 1g acceleration, perfectly doable. But people outside still see it taking 100 000 years... (meaning they will be 100 000 years "older" from the point of view of the astronauts) But from your frame of reference wouldn't you be moving much faster than the speed of light? If you're taking 22 years to travel 10,000 ly, that means you're moving faster than light in your perception, doesn't it? Isn't that forbidden in any frame of reference?

simiones 6y ago
From your frame of reference, the universe is much smaller in the direction of travel. You'd still see light zoom past you at 1c, though.
zaarn 6y ago
From your perspective, the entire length of the milky way is squished into 22 light years (roughly), so not really violating anything. From the outside frame of reference you still take 10000 years (plus) to cross that distance, from your perspective, the distance gets shorter.