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\nDid Time Start at the Big Bang?\n

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\n\nPublisher:\n\nPBS\n\n\n
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\nOur universe started with the big bang. But only for the right definition of “our universe”. And of “started” for that matter. In fact, probably the Big Bang is nothing like what you were taught.\nA hundred years ago we discovered the...\nOur universe started with the big bang. But only for the right definition of “our universe”. And of “started” for that matter. In fact, probably the Big Bang is nothing like what you were taught.\r
A hundred years ago we discovered the beginning of the universe. Observations of the retreating galaxies by Edwin Hubble and Vesto Slipher, combined with Einstein’s then-brand-new general theory of relativity, revealed that our universe is expanding. And if we reverse that expansion far enough – mathematically, purely according to Einstein’s equations, it seems inevitable that all space and mass and energy should once have been compacted into an infinitesimally small point – a singularity. It’s often said that the universe started with this singularity, and the Big Bang is thought of as the explosive expansion that followed. And before the Big Bang singularity? Well, they say there was no “before”, because time and space simply didn’t exist. If you think you’ve managed to get your head around that bizarre notion then I have bad news. That picture is wrong. At least, according to pretty much every serious physicist who studies the subject. The good news is that the truth is way cooler, at least as far as we understand it.\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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12:30
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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, quantum mechanics, time, expansion, size, matter, equations, outer space, astrobiology, black holes, the universe, science fiction
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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, math, calculus, maths, holographic universe, holographic principle, holography, holographs, reality, consciousness, eht black hole, event horizon telescope, big bang, scale factor, incredibly small, north pole, cosmic inflation, physical theory, timelines end, single point, reference moment, universe started, infinite universe, theory, back, infinite, point, universe, 0 dimensional, rewind, beginning, times, fact, compacted
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