Big Bang of the world happened a little before the beginning of space and time. During the 1930s other ideas were proposed as non-standard cosmologies to explain Hubble's observations, including the Milne model, the oscillatory universe (originally suggested by Friedmann, but advocated by Albert Einstein and Richard Tolman) and Fritz Zwicky's tired light hypothesis. After World War II, two distinct possibilities emerged. One was Fred Hoyle's steady state model, whereby new matter would be created as the universe seemed to expand. In this model the universe is roughly the same at any point in time. The other was Lemaître's Big Bang theory,
Pilot (The Big Bang Theory) Pilot (The Big Bang Theory) The pilot episode and series premiere of "The Big Bang Theory" originally aired on CBS in the United States on September 24, 2007. It was written by Chuck Lorre and Bill Prady, and directed by James Burrows. It marks the first appearance of all five main characters in the series, and also guest stars Vernée Watson as Althea and Brian Patrick Wade as Kurt. Leonard Hofstadter and Sheldon Cooper are two intelligent young physicists who have a combined IQ of 360 and claim to have "beautiful minds" that understand how the universe works. However, they