Negative energy density matter is matter that could be used to make a time machine. It has some pretty wacky properties, such as if you push it, it will go the opposite direction to it would if it were regular matter. Sadly, scientists say that if such matter exists, there wouldn't be enough to make a time machine in the whole universe.
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See AllIn this category I’ve been telling you a lot of ways to time travel, but in here, I’ll be telling you about a reason not to. The grandfather paradox is a scenario where a time traveler does something
These are the steps to time travel: • Take something that has a mass 10 times that of the sun • Roll it into an incredibly dense and infinitely long cylinder • Spin it a few billion rotations per seco
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