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If the large-scale universe appears isotropic as viewed from Earth, the cosmological principle can be derived from the simpler Copernican principle, which states that there is no preferred (or special) observer or vantage point.
The second law of thermodynamics states that in a closed system entropy can only increase, and despite its scale the universe itself is a closed system.
In the film's last image, a cosmic web of light formed by the galaxies on large scale, the universe seems to glow like a crystal emerging from the dark.
As a result, we know that on the largest observable scale our universe is flat.
However, the presence of stars and galaxies indicates that below a certain scale the Universe must have begun to deviate from its uniformity.
Above this scale, the Universe appears to be the same in all directions (isotropic and homogeneous).
This supports the cosmological principle that at its largest scale the Universe is homogeneous.
Thus, from the smallest level of scale, the universe is not a place, an empty box in which we reside.
On the largest scale, the Universe is continually expanding, resulting in an average increase in the separation between individual galaxies (see Hubble's law).
It flew in the face of the prevailing wisdom that, over the largest of scales, the universe was fixed and unchanging.
But on smaller scales, the universe is neither homogeneous nor isotropic.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com