- The big bang theory is defined as the theory that the universe may have been created in a huge explosion at least 12 billion years ago, or is a successful comedy series created by Chuck Lorre in 2007 about four geeky scientists and a waitress neighbor.
An example of the big bang theory is the accepted scientific theory that the universe started when a hot dense state expanded and exploded causing the universe to cool and start to convert energy into its current state.
big-bang theory definition by Webster's New World
big-bang theory definition by American Heritage Dictionary
big-bang theory - Cultural Definition
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.
- Scientists have recently found that the expansion of the universe is actually speeding up. This effect is attributed to the presence of dark energy.