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Is Time Travel (going backwards) Possible?
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<blockquote data-quote="Nellisir" data-source="post: 6041891" data-attributes="member: 70"><p>Because gravity is stronger than dark energy on a local (galactic) scale, just as other forces are stronger than gravity at different scales.</p><p></p><p>We think of gravity as this mighty force that holds the sun and the planets together, but you overcome it every time you pick something up off the floor. If other forces weren't stronger than gravity, we'd just be random atoms sprinkled over the planet, unable to come together. We can overcome gravity with simple chemical rockets. Water molecules overcome gravity by getting hot and converting to steam. </p><p></p><p>On small scales, the electromagnetic force is much more powerful than gravity and at atomic scales, the strong force is much more powerful than electromagnetism. (and there's also the weak force, which also works at an atomic level).</p><p></p><p>So, dark energy is still present in galaxies, just like gravity is present in molecules, but gravity is stronger than dark energy at the galactic scale and keeps things (scientifical terms!) bound together.</p></blockquote><p></p>
[QUOTE="Nellisir, post: 6041891, member: 70"] Because gravity is stronger than dark energy on a local (galactic) scale, just as other forces are stronger than gravity at different scales. We think of gravity as this mighty force that holds the sun and the planets together, but you overcome it every time you pick something up off the floor. If other forces weren't stronger than gravity, we'd just be random atoms sprinkled over the planet, unable to come together. We can overcome gravity with simple chemical rockets. Water molecules overcome gravity by getting hot and converting to steam. On small scales, the electromagnetic force is much more powerful than gravity and at atomic scales, the strong force is much more powerful than electromagnetism. (and there's also the weak force, which also works at an atomic level). So, dark energy is still present in galaxies, just like gravity is present in molecules, but gravity is stronger than dark energy at the galactic scale and keeps things (scientifical terms!) bound together. [/QUOTE]
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