00:04Traveling at the speed of light would likely be crucial for traversing the cosmos.
00:08After all, most vast distances in space are measured by light years.
00:11But is there any real way for mankind to ever move that fast?
00:14According to Einstein, not really, but there could be hope.
00:17His theory of relativity explains that as an object with mass gets closer and closer
00:21to traveling at the speed of light, the more and more energy it would need to achieve it.
00:25The math works out that you would need an infinite amount of energy to ever pass the
00:29life speed threshold.
00:30But again, that's for objects with mass.
00:32ScienceAlert points out that theoretical tachyons, or particles with what is sometimes called
00:37imaginary mass, are always traveling the speed of light.
00:40These particles are theoretical, but they are also theoretically always going backwards in
00:44spacetime.
00:45So possibly good for time travel, but even if they're real, likely not going to help us
00:49with space travel.
00:50However, Einstein's theory of relativity does suggest the existence of wormholes is possible,
00:55where we fly an object into one point in space and are deposited elsewhere, possibly
00:59thousands, millions, or even billions of light years away.
01:02Now we just have to find one.
01:04The book a through here, it's been a poll called Time it Gone with Matter.
01:06Wait, you're going through it?
01:08Ready?
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