Opinions on Universe

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For other uses, see Universe (disambiguation).

The Universe is all of time and space and its contents. The Universe includes planets, stars, galaxies, the contents of intergalactic space, the smallest subatomic particles, and all matter and energy. The majority of matter and energy is most likely in the form of dark matter and dark energy.

The part of the Universe that we can see, referred to as the observable universe, is about 28 billion parsecs (91 billion light-years) in diameter at the present time. The size of the whole Universe is not known and may be infinite. Scientific observation of the Universe has led to inferences about its composition and evolution.

Throughout recorded history, cosmologies, cosmogonies, and scientific models have been proposed to explain observations of the Universe. The earliest quantitative geocentric models were developed by the ancient Greek philosophers and Indian philosophers. Over the centuries, more precise observations led to Copernicus's heliostatic model of the Solar System and Kepler's heliocentric and elliptical model of the Solar System. The concept of gravity led to the Newtonian model of the Solar System. Further improvements in astronomical observations led to the realization that the Solar System is located in a galaxy composed of billions of stars, the Milky Way. It was subsequently discovered that our galaxy is just one of many. Careful studies of the distribution of these galaxies and their spectral lines have led to much of modern physical cosmology. The discovery in the early 20th century that galaxies are systematically redshifted suggested that the Universe is expanding, and the discovery of the cosmic microwave background radiation suggested that the Universe had a beginning. Finally, observations in the late 1990s indicated the rate of its expansion is increasing.

The Big Bang theory is the prevailing cosmological model that describes the development of the Universe. Space itself was created in the Big Bang and imbued with a fixed amount of energy and matter; as space expands, the density of that matter and energy decreases. After the initial expansion, the Universe cooled sufficiently to allow the formation first of subatomic particles and later of simple atoms. Giant clouds of these primordial elements later coalesced through gravity to form stars. Assuming that the prevailing model is correct, the age of the Universe is measured to be 13.798 ± 0.037 billion years.

There are many competing hypotheses about the ultimate fate of the Universe. Physicists and philosophers remain unsure about what, if anything, preceded the Big Bang. Many refuse to speculate, doubting that any information from any such prior state could ever be accessible. There are various multiverse hypotheses, in which some physicists have suggested that the Universe might be one among many universes that likewise exist.

In the image below, you can see a graph with the evolution of the times that people look for Universe. And below it, you can see how many pieces of news have been created about Universe in the last years.
Thanks to this graph, we can see the interest Universe has and the evolution of its popularity.

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