37.docx - The universe (Latin: universus) is all of space...

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Theuniverse(Latin:universus) is all ofspaceandtime[a]and their contents,[10]includingplanets,stars,galaxies, and all other forms ofmatterandenergy. TheBig Bangtheory isthe prevailingcosmologicaldescription of the development of the universe. According to estimationof this theory, space and time emerged together 13.799±0.021 billion years ago,[2]and the universehas been expanding ever since. While the spatial size of the entire universe is unknown,[3]the cosmicinflation equation tells us that it must have a minimum diameter of 23 trillion light years,[11]and it ispossible to measure the size of theobservable universe, which is approximately 93 billionlight-yearsin diameter at the present day.The earliestcosmological modelsof the universe were developed byancient GreekandIndianphilosophersand weregeocentric, placingEarthat the center.[12][13]Over the centuries, more preciseastronomical observations ledNicolaus Copernicusto develop theheliocentric modelwith theSunatthe center of theSolar System. In developing thelaw of universal gravitation,Isaac Newton

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