The Big Bang Theory is the theory of the Universe beggining its life as an infinitely small, hot singularity and gradually expanding to its current size today
Galaxies appearing to be moving away from each other suggesting the expansion of the Universe
Leftover heat from the Big Bang being present around the Universe as Cosmic Microwave Brackground
Abundance of "light elements" such as hydrogen and helium throughout the Universe
The singularity carried space, energy, and time therefore it didn't a appear in space, but rather in absolute nothingness
The Big Bang wasn't an explosion, it was an expansion
Inflation from the Big Bang should've marked the CMB with gravitational waves but interstellar dust may also just be imitating te effect of scattering microwaves as well
There are there variations of the Big Bang as well like one where there are multiple universes symmetric with reference to time, as many move backward as they move forward.There were many Big Bangs, not just one.
This is the only slide where it's not about the beginning but rather, The End
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