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RE: I have a dream...

in #science6 years ago

There are 3 ways to move faster than light without breaking the laws of physics:

  1. Light is slower in a material like water. Something like 66% of the speed in a vacuum. Subatomic particles can briefly move faster than this in water before slowing down via Cherenkov radiation. Kind of a cheat so let's move on.

  2. Two entangled sub-atomic particles are moving away from each other very fast. We measure the spin of one and find that it is spin-up. Somehow this information gets instantly transmitted to the other particle and it is always measured to be spin-down.

  3. The spacetime of the universe is expanding. The farther you go away the faster things are moving away. The rate is something like 70 km/s per megaparsec. At the edge of the observable universe (14 billion light years away) space is moving as fast as the speed of light dragging everything away with it. Further away and spacetime is moving away faster than the speed of light. Physics is not violated because nothing is moving locally faster than light, it is just the fabric of spacetime that it doing so.

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thanks for sharing in-depth knowledge on this subject @procrastilearner ... which truly adds more value to the above post.

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