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Is Time Travel (going backwards) Possible?
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<blockquote data-quote="Umbran" data-source="post: 6044346" data-attributes="member: 177"><p>The term "considerably more gravity" does not have a well-defined technical meaning.</p><p></p><p>There's a whole lot more mass out there, yes. But it is very, very far away. And the force exerted by that mass drops off with the square of the distance. So, the acceleration due to gravity from the galaxy is actually small. </p><p></p><p>Now, what you're actually suggesting we look for is the difference in forces on the planet - when it is close to the galactic core in its orbit, and when it is farther away. Compared to the distance to the galactic core, the distance across the orbit is very, very small. The planetary orbit is really just a dot by comparison.</p><p></p><p>Hm. Let me see...</p><p></p><p>It is about 27,000 light years to the galactic core. Meanwhile, the Earth's orbit is about 8 light minutes in radius. That's about 1.5x10^-5 light years. So, the differences are going to be very small indeed.</p><p></p><p>I think you overestimate our technical abilities, if you think we should, with current tech, be able to measure such differences.</p></blockquote><p></p>
[QUOTE="Umbran, post: 6044346, member: 177"] The term "considerably more gravity" does not have a well-defined technical meaning. There's a whole lot more mass out there, yes. But it is very, very far away. And the force exerted by that mass drops off with the square of the distance. So, the acceleration due to gravity from the galaxy is actually small. Now, what you're actually suggesting we look for is the difference in forces on the planet - when it is close to the galactic core in its orbit, and when it is farther away. Compared to the distance to the galactic core, the distance across the orbit is very, very small. The planetary orbit is really just a dot by comparison. Hm. Let me see... It is about 27,000 light years to the galactic core. Meanwhile, the Earth's orbit is about 8 light minutes in radius. That's about 1.5x10^-5 light years. So, the differences are going to be very small indeed. I think you overestimate our technical abilities, if you think we should, with current tech, be able to measure such differences. [/QUOTE]
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