big bang theory
noun Astronomy.
a theory that deduces a cataclysmic birth of the universe (big bang) from the observed expansion of the universe, cosmic background radiation, abundance of the elements, and the laws of physics.
Also called
big-bang model.
Compare
steady state theory.
Origin of big bang theory
First recorded in 1950–55
Words nearby big bang theory
big apple, the,
big as life,
big bad wolf,
big band,
big bang,
big bang theory,
big beast,
big beat,
big belt mountains,
big ben,
big bend national park
British Dictionary definitions for big bang
big bang
noun
any sudden forceful beginning or radical change
(modifier)
of or relating to the big-bang theory
(sometimes capitals)
the major modernization that took place on the London Stock Exchange on Oct 27 1986, after which the distinction between jobbers and brokers was abolished and operations became fully computerized
Scientific definitions for big bang
big bang
[ bĭg ]
The explosion of an extremely small, hot, and dense body of matter that, according to some cosmological theories, gave rise to the universe between 12 and 20 billion years ago. Compare big crunch steady state theory. See also open universe.
A Closer Look
In the 1920s astronomer Edwin Hubble discovered that wherever one looked in space, distant galaxies were rapidly moving away from Earth, and the more distant the galaxy the greater its speed. Through this observation he determined that the universe was becoming larger. Hubble also found that the ratio between a galaxy's distance and velocity (speed and direction of travel) was constant; this value is called the Hubble constant. By calculating the distance and velocity of various galaxies and working backward, astronomers could determine how long ago the expansion began-in other words, the age of the universe. The figure, which scientists are constantly refining, is currently thought to be between 12 and 20 billion years. According to the widely accepted theory of the big bang, the universe was originally smaller than a dime and almost infinitely dense. A massive explosion, which kicked off the expansion, was the origin of all known space, matter, energy, and time. Scientists are also attempting to calculate how much mass the universe contains in order to predict its future. If there is enough mass, the gravity attracting all its pieces to each other will eventually stop the expansion and pull the universe back together in a big crunch. There may not be enough mass, however, to result in an eventual collapse. If that is the case, then the universe will expand forever, and all galaxies and matter will drift apart, eventually becoming dark and cold.
Cultural definitions for big bang
Big Bang theory
In astronomy, a theory according to which the universe began billions of years ago in a single event, similar to an explosion. There is evidence for the Big Bang theory in the observed red shift of distant galaxies, which indicates that they are moving away from the Earth, in the existence of cosmic microwave background, and from other data. The Big Bang theory of the origin of the universe is accepted by most astronomers today.
notes for Big Bang theory
Scientists have recently found that the expansion of the universe is actually speeding up. This effect is attributed to the presence of
dark energy.