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When supercolliders form matter from energy, as expected from the laws of physics, equal parts of matter and antimatter form; and if they come into contact, they annihilate one another.

Big Bang theorists have spent decades looking for antimatter regions of the universe with leading astronomers culminating a significant project by writing in The Astrophysical Journal: "we conclude that a matter-antimatter symmetric universe is empirically excluded." The journal reports a physicist's assessment: "The work is extremely compelling and gives me fresh pessimism" that is, on the difficulty of explaining why the universe even exists.

Consider also from Ostriker & Milton, for Lemaître in "Belgium in 1925...

Slipher's spectra established that the spiral nebulae are extragalactic and gave their velocities... "both of those models were [valid] solutions to Einstein's equations..." - 1926 Edwin Hubble: Extra-galactic Nebulae: "This contribution gives the results of a statistical investigation of 400 extragalactic nebulae for which Holetschek has determined total visual magnitudes." - 1927 Georges Lemaître: Two years before Hubble, Lemaître explicitly published what was later misnamed the "Hubble Law", in his paper, "A homogeneous universe of constant mass and increasing radius accounting for the radial velocity of a period of time in which the universe was static.

The Corrected History of the Discovery of Expansion: On the entire Internet, the following is the most concise and reasonably comprehensive chronology of the discovery of the (apparent) expansion of the universe.

The Day We Found the Universe, Princeton's cosmologist James Peebles, A Different Approach to Cosmology, Discovering the Expanding Universe, and the proceedings of a conference titled, The Big Bang and Georges Lemaître.

So consider this concise, corrected chronology of discovery: - 1912 Vesto Slipher: The radial velocity of the Andromeda Nebula.

- 1915 Slipher: "the average velocity of the spirals is about 25 times the average stellar velocity." - 1917 Willem de Sitter: "The lines in the spectra of very distant stars or nebulae must therefore be systematically displaced towards the red, giving rise to a spurious positive radial velocity" [earliest redshift cosmological hypothesis].

[equation #] 24, and from the English text [and that this] suggests that this exclusion by the translator was deliberate..." However, that shocking and historic omission primarily benefitted Hubble and it was only one year earlier that Hubble himself was insisting that he be given full credit (regardless of the truth) for this discovery.

For a creationist and a secular explanation of this problem, see creation.com's report on the Discovery Channel's How the Universe Works, and see this Fermilab antimatter video: Yet even secular science authorities have begun objecting to the systematic misattribution, and hence, post-dating, of the the claim of expansion.

Expansion was not a "prediction" of the 1931 big bang theory; it was a 1920s interpretation of both Einstein's equations and red-shift data.

Yet many of the most extensive scientific observations ever made suggest otherwise, and they don't give a ringing endorsement to the Copernican principle either.

The first couple items in this list come from the highly sophisticated maps of the (shadowless) CMB (cosmic microwave background) and subsequent analysis.

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