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\nCould the Universe End by Tearing Apart Every Atom?\n

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\n\nPublisher:\n\nPBS\n\n\n
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\nThe universe is expanding, and that expansion is accelerating. We don’t know what’s causing that acceleration, but that hasn’t stopped us from giving it a name. We call this unknown influence dark energy. The observed acceleration is,...\nThe universe is expanding, and that expansion is accelerating. We don’t know what’s causing that acceleration, but that hasn’t stopped us from giving it a name. We call this unknown influence dark energy. The observed acceleration is, for the most part, nicely described with a constant density of dark energy – the same amount of this stuff in every block of space. Which means if you increase the volume you increase the overall amount of dark energy – hence accelerating expansion. Mathematically we describe a constant energy density with the cosmological constant in the equations of Einstein’s general theory of relativity. But what if dark energy is NOT constant? What if the energy density in each patch of space increases over time? In that case, the acceleration itself could be … accelerating. That would be bad.\n
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Resource Details

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Curator Rating
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Educator Rating
Not yet Rated
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Media Length
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13:21
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Grade
12th - Higher Ed
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Subjects
Science
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Media Type
Instructional Videos
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Source:
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\nPBS Space Time\n\n
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Date
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2019
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Language
English
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Audiences
For Teacher Use
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Usage Permissions
Fine Print: Educational Use
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Concepts

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space, time, expansion, galaxies, pressure, mass, density, light, years, acceleration, outer space, quantum mechanics, astrobiology, black holes, the universe
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Additional Tags

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physics, astrophysics, space physics, pbs, space time, pbs space time, matt o’dowd, einstein, einsteinian physics, general relativity, special relativity, dark energy, dark matter, big rip, how will the universe end, end of the universe, the big rip, what is the big rip?, phantom energy, cosmological constant, ratio pressure, pressure term, galaxy clusters, energy density, expansion rate, universe expands, accelerating expansion, constant, rate, increases, accelerating, galaxy, negative, state, party, parameter, idea
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Classroom Considerations

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