Reply to Re: Time Machine
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'The speed of light is a universal constant and nothing can move faster than it because light is pure energy.'
The speed of light isn't a universal constant. The maximum speed (186,000 miles per second) is. But the speed of light itself can be slowed down under certain conditions... I think they've succeeded in slowing it down to around 30 miles per hour in the laboratory.
Light is not pure energy. Light is just photons shooting blissfully through the air.
Anyway... there are theoretical particles called tachyons. They go faster than the speed of light, and hence travel back in time. But no-one has found explicit evidence that they exist. They're sort of like gravitons (particles that control gravity) in that sense; physicists suspect that they exist, but we haven't found any yet.
Oh, that reminds me: we do have evidence of things 'going' faster than the speed of light... much faster. Instantaneously 'traveling' across several miles.
Basically, a quantum particle can be 'entangled' with another quantum particle. When one spins clockwise, the other will spin counter-clockwise. And what they've done is entangled two quantum particles, seperated them by several miles, and spun one. The other spins the opposite direction instantaneously. And physicists have absolutely no idea how this works. They can't find any particles being sent between them... but there has to be *some* sort of information being relayed between them, and it travels faster than the speed of light.
One more thought: there are 3 ways that physicists think time travel could work. I've forgotten them, but they were all pretty improbable... like creating a small bar (maybe 1 foot in diameter, I dunno) with infinite length and infinite mass and traveling around it at certain trajectories in a space craft.
The speed of light isn't a universal constant. The maximum speed (186,000 miles per second) is. But the speed of light itself can be slowed down under certain conditions... I think they've succeeded in slowing it down to around 30 miles per hour in the laboratory.
Light is not pure energy. Light is just photons shooting blissfully through the air.
Anyway... there are theoretical particles called tachyons. They go faster than the speed of light, and hence travel back in time. But no-one has found explicit evidence that they exist. They're sort of like gravitons (particles that control gravity) in that sense; physicists suspect that they exist, but we haven't found any yet.
Oh, that reminds me: we do have evidence of things 'going' faster than the speed of light... much faster. Instantaneously 'traveling' across several miles.
Basically, a quantum particle can be 'entangled' with another quantum particle. When one spins clockwise, the other will spin counter-clockwise. And what they've done is entangled two quantum particles, seperated them by several miles, and spun one. The other spins the opposite direction instantaneously. And physicists have absolutely no idea how this works. They can't find any particles being sent between them... but there has to be *some* sort of information being relayed between them, and it travels faster than the speed of light.
One more thought: there are 3 ways that physicists think time travel could work. I've forgotten them, but they were all pretty improbable... like creating a small bar (maybe 1 foot in diameter, I dunno) with infinite length and infinite mass and traveling around it at certain trajectories in a space craft.
