Measurements of the redshifts of supernovae indicate that the expansion of the universe is accelerating, an observation attributed to dark energy's existence. Most of the gravitational potential in the universe seems to be in this form, and the Big Bang theory and various observations indicate that this excess gravitational potential is not created by baryonic matter, such as normal atoms. Besides these primordial building materials, astronomers observe the gravitational effects of an unknown dark matter surrounding galaxies. Giant clouds of these primordial elements-mostly hydrogen, with some helium and lithium-later coalesced through gravity, forming early stars and galaxies, the descendants of which are visible today. Īfter its initial expansion, an event that is by itself often called "the Big Bang", the universe cooled sufficiently to allow the formation of subatomic particles, and later atoms. Detailed measurements of the expansion rate of the universe place the Big Bang singularity at around 13.8 billion years ago, which is thus considered the age of the universe. Extrapolating this cosmic expansion backwards in time using the known laws of physics, the theory describes an increasingly concentrated cosmos preceded by a singularity in which space and time lose meaning (typically named "the Big Bang singularity").
The model describes how the universe expanded from an initial state of high density and temperature, and offers a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background (CMB) radiation, and large-scale structure.Ĭrucially, the theory is compatible with Hubble–Lemaître law-the observation that the farther away a galaxy is, the faster it is moving away from Earth. In doing so, it allows Sheldon and Leonard to do for science what Frasier's Crane brothers did for fine dining, art, and opera.The Big Bang theory is the prevailing cosmological model explaining the existence of the observable universe from the earliest known periods through its subsequent large-scale evolution. The show distinguishes itself by being unafraid to toss scientific references and technobabble into an otherwise standard sitcom, even employing a physicist to keep things accurate. Rounding out the crew are the smarmy Wolowitz, who thinks he's as sexy as he is brainy, and Koothrappali, who suffers from an inability to speak in the presence of a woman. Created by writer/producers Chuck Lorre (of Two and a Half Men) and Bill Prady (of Gilmore Girls) comes The Big Bang Theory, a sitcom that shows what happens when hyperintelligent roommates/physicists Sheldon and Leonard meet Penny, a beautiful woman moving in next door-and realize they know next to nothing about life outside of the lab.
Summary: Created by writer/producers Chuck Lorre (of Two and a Half Men) and Bill Prady (of Gilmore Girls) comes The Big Bang Theory, a sitcom that shows what happens when hyperintelligent roommates/physicists Sheldon and Leonard meet Penny, a beautiful woman moving in next door-and realize they know next to nothing about life outside of the lab.
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