Abstract
According to modern scientific understanding, at the large scale, our universe is an expanding, homogeneous, and isotropic space, approximately 14 billion years (14 bi) old. The size of the universe is defined by the distance which light can cover in this time period, which is quite big. We are learning more about the history of the universe every year. One of the most interesting questions is that how we can explore and understand such an old and gigantic universe, if the region of space where the observations are performed is confined primarily to a small part of our Solar System, which has almost negligible size even compared to the typical distances in our galaxy. The time interval of our observations is also restricted to just a few thousands of years, and of scientific instrumental observations to much less than that. The answer to this question is that there are many qualitatively different observables and methods of observations.
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Shapiro, I.L. (2019). Basic Elements of Cosmology. In: A Primer in Tensor Analysis and Relativity. Undergraduate Lecture Notes in Physics. Springer, Cham. https://doi.org/10.1007/978-3-030-26895-4_16
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