History of the Universe from Big Bang through inflation to today's accelerating expansion (Image: NASA)
Hubble Ultra Deep Field, showing thousands of galaxies back to a time only a few hundred million years after the Big Bang (Image: NASA)
It is dangerous to bet against Einstein. Cosmological research shows that the rate at which the Universe expands is increasing, rather than decreasing as was previously thought. The concept of "dark energy" with a negative pressure was introduced to describe this acceleration. Now measurements of the proton to electron mass ratio (PEMR) over the past seven billion years strongly suggest that the models of dark energy are far more contrived in explaining accelerating expansion than is Einstein's self-proclaimed "biggest blunder" – the cosmological constant.
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