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Science & Technology
What exactly is gravity?
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<blockquote data-quote="Harte" data-source="post: 200876" data-attributes="member: 443"><p>Those velocities aren't additive unless you stipulate what reference they're moving with respect to.</p><p>There is no still point to use as a reference. Velocity and acceleration are entirely relative. Thus, "Relativity."</p><p></p><p>Depending on where the observer is, the Earth (by their measurment) might well be approaching the speed of light. You'd have to be observing us from what to us appears as the edge of the visible universe though. But were we to observe the observer - looking back at them from Earth, it would be <strong>them</strong> that is moving almost as fast as light. </p><p></p><p>You know, once the speed of light is reached there is no "observing."</p><p></p><p></p><p>One can always say "maybe higher dimensions are involved." But in the case of gravity, Relativity explains everything we can observe about it (and still predicts some things we can't observe yet) without resorting to higher dimensions. If you want those, you have to look at unified field theories like M-Theory or String Theory. </p><p>The higher dimensions are for resolving the differences between Relativity and Quantum Mechanics.</p><p></p><p>Harte</p></blockquote><p></p>
[QUOTE="Harte, post: 200876, member: 443"] Those velocities aren't additive unless you stipulate what reference they're moving with respect to. There is no still point to use as a reference. Velocity and acceleration are entirely relative. Thus, "Relativity." Depending on where the observer is, the Earth (by their measurment) might well be approaching the speed of light. You'd have to be observing us from what to us appears as the edge of the visible universe though. But were we to observe the observer - looking back at them from Earth, it would be [B]them[/B] that is moving almost as fast as light. You know, once the speed of light is reached there is no "observing." One can always say "maybe higher dimensions are involved." But in the case of gravity, Relativity explains everything we can observe about it (and still predicts some things we can't observe yet) without resorting to higher dimensions. If you want those, you have to look at unified field theories like M-Theory or String Theory. The higher dimensions are for resolving the differences between Relativity and Quantum Mechanics. Harte [/QUOTE]
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What exactly is gravity?
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