If we could travel at light speed, would travel be 'instantaneous' for us??

by Bad_Wolf 14 Replies latest social current

  • Simon
    Simon
    We know that as you approach the speed of light, time slows down, if you were in a spaceship, time goes by quicker on earth.

    Not quite, it's that things are relative ... and exactly which is travelling? Against what point? If you are shooting off at the speed of light in a spaceship, for all intents the spaceship is still and Earth is shooting off at the speed of light. You both see time relative to the other.

    The problem with all the "everyone else aged" movie plots is that it ignores the return journey, where the reverse would be happening.

    if you were able to travel at the speed of light, and you were to go to a planet 1,000 light years away, would you/your body/the spaceship 'age' 1000 years to get there?

    You would be experiencing time local to you passing at the same rate in exactly the same way that if you are in the fastest plane, you still age by the exact time that you are in that plane.

    The trouble with thinking about time and space in this way is that you assume a "now". There is no universal time of events in the universe to happen before or after others - you simply see things relative to your own locality and the further you look, the further back in time (your time) you are seeing things, but people there would see things where you are being further back in time.

    Stick to euclidean space, it's what we're good at.

  • waton
    waton
    S:Stick to euclidean space, it's what we're good at.

    or to repeat a hackneyed phrase:

    There are only a handful of people in the world that really understand relativity, the speed of light, - -we are so privileged to have them on this forum.

  • Vidiot
    Vidiot
    Anders Anderson - " I saw that movie, but couldn't remember anything related to time dilation (or anything beyond Sandra Bullock outside a space station)."

    You're thinking of Gravity.

    Intersteller starred Matthew McConaughey.

  • Anders Andersen
    Anders Andersen
    The problem with all the "everyone else aged" movie plots is that it ignores the return journey, where the reverse would be happening.

    No. Higher speed means slower passing of time (as compared to time passing as seen from the reference frame of those with the lower speed). The direction of travel has no influence on this. So both on the way out as the way back the high speed traveler will age slower than those left behind.

    Such is the weirdness and counterintuitive effect of special relativity.

    You're right though that in the reference frame of the high speed traveler time will pass at the same speed as usual.

  • Anders Andersen
    Anders Andersen
    Higher speed means slower passing of time (as compared to time passing as seen from the reference frame of those with the lower speed).

    This is actually a very poor explanation by the way 🤣🤣🤣 Naturally both frames of reference are moving with regards to the other, and in each frame of reference it appears that time outside the own frame of reference moves slower.

    Regardless, any high speed traveler will appear to have aged less than someone who didn't reach the high speeds. The apparent paradox is solved because the traveler experiences acceleration, which causes asymmetrical time dilation (whatever that may be lol)

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