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The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The notion of an expanding universe was first scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations.
The absurd universe: Our universe just happens to be the way it is. The unique universe: There is a deep underlying unity in physics that necessitates the Universe being the way it is. A Theory of Everything will explain why the various features of the Universe must have exactly the values that have been recorded.
Echoing this, Stephen Hawking states, "A theory is a good theory if it satisfies two requirements: It must accurately describe a large class of observations on the basis of a model that contains only a few arbitrary elements, and it must make definite predictions about the results of future observations." He also discusses the "unprovable but ...
The physical universe is defined as all of space and time [a] (collectively referred to as spacetime) and their contents. [10] Such contents comprise all of energy in its various forms, including electromagnetic radiation and matter, and therefore planets, moons, stars, galaxies, and the contents of intergalactic space.
A strong acceptance of Aristotle's theories of the universe, combined with a more practical lifestyle practiced by the Roman people, caused the later Stoics to focus their main effort on their own social well-being on earth, not on the cosmos. [34] A prime example are the Stoic-influenced writings of the Roman Emperor Marcus Aurelius (121–180).
A moral universe implies that we live in a basically spiritual universe that is somehow ordered by a higher power, by invisible feelings of good and bad, a 'cosmic order' reminiscent of the early Greeks [1] that underpins and motivates our actions. Or a 'moral force' that means our actions must have definite effects which we carry with us.
Pantheism is the philosophical and religious belief that reality, the universe, and nature are identical to divinity or a supreme entity. [1] The physical universe is thus understood as an immanent deity, still expanding and creating, which has existed since the beginning of time. [2]
Cosmology is a branch of metaphysics that deals with the nature of the universe, a theory or doctrine describing the natural order of the universe. [36] The basic definition of Cosmology is the science of the origin and development of the universe. In modern astronomy, the Big Bang theory is the dominant postulation.