Cosmological Principle

The Cosmological Principle and the Copernican Principle are philosophies which state that humans on the Earth or in the Solar System are not privileged observers of the universe. Due to this philosophy astronomical observations must consequently be interpreted under the context of current astronomical theories, regardless of what reality might otherwise suggest. Read the following quote carefully:

Below are miscellaneous quotes from astronomers and authors remarking that the universe is the same everywhere we look.

Cosmological Redshift
Blueshift and redshift as we experience on Earth doesn't occur with stars and galaxies. The theories need to be modified. Most galaxies we see are redshifted to a degree that doesn't really make sense, and the implication is that we are the center of the universe. The cosmological redshift is known as Hubble’s law, and postulated that the known universe is expanding. Hypothetical mechanisms were put in place to change the observation and its implications into an expanding universe.

See this quote from Edwin Hubble:

Stephen Hawking says:

From Paul Davies in Nature:

The concept of a central earth was rejected because it was unwelcomed and alternative hypothetical ideas were pushed. Never was it proven experimentally that the metric expansion of space was actually occurring to cause the redshifts. It is deemed sufficient that an explanation seems to work.