![]() "The situation is that a man sets off in a rocket travelling at high speed away from Earth, whilst his twin brother stays on Earth.the twin in the spaceship considers himself to be the stationary twin, and therefore as he looks back towards Earth he sees his brother ageing more slowly than himself." For the entire outward and return parts of the trip, B does observe A's clock running slow." ![]() ![]() 14: "Twin A stays on the earth, while twin B flies quickly to a distant star and back. Here are Einsteinians who, unlike Neil deGrasse Tyson, are telling the truth:ĭavid Morin, Introduction to Classical Mechanics With Problems and Solutions, Chapter 11, p. "As you travel faster time ticks MORE SLOWLY for you than it does for other people who are not."Īctually, special relativity says the opposite:Īs you travel faster, time ticks FASTER for you than it does for other people who are not. That is, the assumptions, true or false, logically entail some conclusions, but "the traveling twin returns younger" is not one of them. That the traveling twin returns younger, per se, is an idiocy of course but there is something much more idiotic in the story: The youthfulness of the traveling twin does not follow from the two assumptions (Einstein's 1905 postulates). For example: As you travel faster time ticks more slowly for you than it does for other people who are not." Given those two tenets, extraordinary spooky phenomena derive from them. That's Assumption 1 which by the way the experiment has shown to be true. You always get the same measurement for the speed of light. It makes only two assumptions: that the speed of light in a vacuum is constant no matter who is doing the measurement and no matter in what direction you are moving or how fast. Neil deGrasse Tyson: "One of the towering great achievements of the human mind in our understanding of the universe is Einstein's theories of relativity. This is a clear way of realizing that the future "already exists" (as we can experience it "in a minute")." As a gedanken experiment (if we neglect practicalities such as the technology needed for reaching velocities comparable to the velocity of light, the cost of the fuel and the capacity of the traveller to sustain high accelerations), it shows that a sentient being can jump, "within a minute" (of his experienced time) arbitrarily far in the future, say sixty million years ahead, and see, and be part of, what (will) happen then on Earth. ![]() ![]() Let us emphasize that this striking example of time dilation proves that time travel (towards the future) is possible. Thibault Damour: "The paradigm of the special relativistic upheaval of the usual concept of time is the twin paradox. ![]()
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