The Possibility of Time Travel into the Future and the Paradoxes that Arise
TLDR Time travel into the future may be possible by traveling at near light speed, as demonstrated by the GPS satellites, but traveling into the past is generally dismissed by physicists due to the paradoxes that arise, such as the grandfather paradox.
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00:00
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03:46
A man named Andrew Basagiel claims to have been part of a DARPA initiative called Project Pegasus, which involved using children for time travel, and his story is based on technology from Nikola Tesla.
07:12
Stephen Hawking wrote an article about time travel, comparing time to a river that flows in one direction but at different speeds in different spots, and he believes that traveling into the future is possible by going really fast, although his math was corrected to say that you would need to go 20,000 times faster than the speed of light, which would require a huge ship with enough fuel to accelerate constantly for six years, and after reaching 90% of the speed of light, time on the ship would start to travel faster relative to Earth, and after two more years, at 99% of the speed of light, time on the ship would be significantly faster than on Earth, allowing for potential time travel into the future.
10:32
Carl Sagan suggests that time travel into the future may be possible, but not into the past, and that time travelers may not have reached our time yet or can only go back to the moment time travel is invented, while Stephen Hawking points out that a ship traveling at near light speed could be used for long-distance trips within the Milky Way.
13:51
Time travel into the future is possible by exploiting space time, as demonstrated by the GPS satellites that gain an extra third of a billionth of a second every day due to gravitational time dilation.
17:33
If you were able to circle the super dense point of Sagittarius A without falling in, you would experience time at half the rate on Earth, which is time travel.
20:48
Physicists generally dismiss the idea of traveling back in time due to the paradoxes that arise, such as the grandfather paradox, but a consistent cause of loop, like the one in the movie "Back to the Future," is paradox-free and could potentially happen.
24:16
The paradox of time travel, where the origination of something comes as a result of time travel, violates the law of causality.
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