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The evidence that the space within our Universe was almost infinitely dense about 13.7 billion years ago, and has been expanding at a (pretty much) steady rate ever since, is overwhelmingly persuasive.

1) The distance between us and all distant galaxies is increasing, and the rate at which that distance is increasing is directly proportional to the distance to those distant galaxies.

2) The existence, spectrum, and isotropy of the cosmic microwave background radiation.

3) The ratio of hydrogen to helium in all parts of our Universe.

4) Quasars are seen far from us, but not close to us.

5) The ratio of long-lived isotopes to their decay products.

6) The absence of white dwarf stars older than about ten billion years.

The evidence supporting Big Bang Cosmology is as solid as the evidence for a heliocentric solar system.

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