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
Cultural definitions for big bang theory
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.