Comment by mock-possum

Comment by mock-possum 4 days ago

That doesn’t make sense - if you were traveling at the speed of light, it would take you 5000 years to travel 5000ly - longer if you were just ‘very close’ to C. Time wouldn’t advance slowly for you, it wouldn’t advance perceptively different at all - you’d still live every second of those 5000 years.

ghosty141 4 days ago

I dont think you are right. Light for example doesnt perceive time at all. From the photons point of view it never aged even a microsecond while it traveled lightyears. Time is relative too so from our POV 1 year passed when a photon traveled 1 ly, but for the photon no time passed.

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zwily 4 days ago

Read up on time dilation and special relativity. Time absolutely does pass slower for you as you accelerate.

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IAmBroom 4 days ago

You two are talking about different meanings of "time".
Traveling 5,000 LY at 0.5 c will cause you the spaceship pilot to age 20,000 years. It's non-relativistic, inside that inertial frame. Clock second hands still sweep slow but noticeable circles.
Meanwhile, everyone outside of the spaceship is happening FAST, by your observations. You'll see stars turn red and go supernova.

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- mr_toad 4 days ago
  
  The journey will take 10,000 years for an external stationary observer and about 8695 years for the pilot.
  
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