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An Overview of the Oldest Objects in the Universe

One of the most significant concepts which have shaped the current comprehension of astronomy is the expansion of the Universe.

Einstein concluded through his theory of General Relativity that space is “flexible,” and that the elementary state of the Universe on larger scales is of expansion, contraction, or of a perfect balance.Then, along with the help of earlier works done by Henrietta Leavitt, Edwin Hubble measured the distances of around 46 relatively local galaxies and united these observations and conclusions with velocity measurements from the literature.

Not only did this work establish the presence of galaxies outside and other than the Milky Way for the first time, but it also showed that these galaxies were running away from us and ultimately concluded, the Universe itself was expanding and contracting at times.In order to obtain a sample of the oldest objects in the Universe across a varied range of cosmic time, the authors consulted a group of surveys that have targeted both the galaxies and quasars. After applying to a series of quality cuts, the authors then grouped these objects into the redshift slices and selected only the oldest one in each redshift slice.

The outcome is a collection of object ages and their associated redshifts, which can be used to deduce an upper limit on the Hubble Constant using the inverse-proportionality of the age of the Universe and the rate of expansion.By means of the conclusions made by the authors, measuring the ages of existing objects in the Universe offers a notable path for understanding the basic laws of the Universe.

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