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General relativity can be employed to describe the universe on the largest possible scale. There are several possible solutions to the equations of general relativity, and each solution implies a possible ultimate fate of the universe. Alexander Friedmann proposed several solutions in 1922, as did Georges Lemaître in 1927. [4]
22 billion years in the future is the earliest possible end of the Universe in the Big Rip scenario, assuming a model of dark energy with w = −1.5. [21] [22] False vacuum decay may occur in 20 to 30 billion years if the Higgs field is metastable. [23] [24] [25]
The Big Crunch is a hypothetical scenario for the ultimate fate of the universe, in which the expansion of the universe eventually reverses and the universe recollapses, ultimately causing the cosmic scale factor to reach absolute zero, an event potentially followed by a reformation of the universe starting with another Big Bang.
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The theme is said to revolve around "mak[ing] contact with intelligent life, surviving the end of the universe, the physics of alien life, and more." [63] 30:15 In the third episode, "In Search of Giants," it will deal with "making contact with intelligent life, intergalactic civilizations, and surviving the end of the universe."
This episode explores the theories of the big crunch, the big rip and the big freeze, that are postulated by physicists as possible fates for the universe. [3] Al-Khalili indicates that the difficulty in understanding this is our limited ability to comprehend something of such immensity both physically and philosophically. [4]
In physical cosmology, the Big Rip is a hypothetical cosmological model concerning the ultimate fate of the universe, in which the matter of the universe, from stars and galaxies to atoms and subatomic particles, and even spacetime itself, is progressively torn apart by the expansion of the universe at a certain time in the future, until distances between particles will infinitely increase.
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