This discovery clears up a nagging paradox that arose from previous age estimates. Presumably, the universe itself is at least as old as the oldest globular clusters that reside in it. After eight years of Cepheid observations this work was concluded by finding that the expansion increases with 70 km/second for every 3.26 million light-years you look further out into space. The Hubble constant, which measures the expansion rate, together with the total energy density of the Universe, sets the size of the observable Universe, its age, and its radius of curvature. The Hubble constant (H 0) is one of the most important numbers in cosmology because it can be used to estimate the size and age of the Universe.
The Hubble constant is … The Hubble Constant is the unit of measurement used to describe the expansion of the universe. An alternative approach to estimating is the age of the universe is to measure the “Hubble constant”. This discovery clears up a nagging paradox that arose from previous age estimates.
The Hubble constant indicates the rate at which the Universe is currently expanding, so although it is called a ‘constant’ it changes with time. The Appendix describes the relationship between the age of the universe and the Hubble constant in different cosmologies and explains why many cosmologists believe that the universe is flat.
New Paper 3 Hubble constant and the age of the Universe.pdf. The Hubble constant is a measure of the current expansion rate of the universe. As the team's measurements have become more precise, their calculation of the Hubble constant has remained at odds with the expected value derived from observations of the early universe's expansion. It seems a very simple calculation from the Hubble constant gave us a number for the age of the universe. But since the 1960's it's been known that the universe is "flat" as accurately as we can measure i.e. One of Hubble's initial 'core' purposes was to determine the rate of expansion of the Universe, known to astronomers as the "Hubble Constant". Combining Hubble's constant measurement with estimates for the density of the universe, the team determined that the universe is approximately 12 billion years old -- similar to the oldest stars. Hubble's constant is probably a little larger than the inverse of the age of the Universe.
Since the Planck value for the age of the Universe is within 0.13% of the sages' value, it seems that the Planck team is right about the Hubble constant.
Extrapolating Back to the Big Bang. The uncertainty has been narrowed down to 20 million years, based on a number of studies which all gave extremely similar figures for the age. 5accad4ba6fdcc8bfc87ee9d.pdf. A Universe that expands more quickly needs to have less matter and more dark energy, and its Hubble constant multiplied by the age of the Universe will have a larger value. The Hubble time for the age of the universe can be reduced quite a bit from the conventional 13.8E+9 years old universe commonly reported. The reason they are close is somewhat of a coincidence, for example in the standard Lambda-CDM model of the Universe, in the far future the age of the Universe will become vastly larger than the inverse of the Hubble constant, because H asymptotically approaches a constant value. New Paper 3 Hubble constant and the age of the Universe.pdf.
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