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All of your questions have no good answer at this point in time. All of them are being researched by physicists, cosmologists, and theorists. We don't even know whether our universe is the only universe or whether what lies beyond the visible universe is just more space like the kind we can see. Our best theories of space and time (Einstein's General ...

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The EM drive is in the headlines again on Yahoo.com. In a new round of testing, NASA confirms yet again that the 'impossible' EMdrive thruster works There exists a web page and a "theory" by the proponent Suppose that an effect really exists. The main objection is momentum conservation, because the setup sounds like a variant of the bootstrap effect: ...

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This is not unique to light. For this behavior there are 2 kinds of "particles", the fermions and the bosons. The first have the "Pauli exclusion" phenomena: 2 identical fermions can't have the same state (quite close to saying "not be at the same place"), while 2 bosons can. This relates to their spin: fermions' spins are half-integers while bosons are ...

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I prefer to look at it based on certain Laws and observations. The First and second Law of Thermodynamics are true Energy is conserved and the universe is moving towards increasing entropy. The Hubble constant is accurate and the universe is expanding at an exponential rate given by $a(t) = e^{Ht}$, where the constant $H$ is the Hubble expansion rate and ...

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