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,
The Big Bang Theory (season 9) The Big Bang Theory (season 9) The ninth season of the American sitcom "The Big Bang Theory" started airing on CBS on Monday, September 21, 2015. It returned to its regular Thursday time slot on November 5, 2015 for the season's seventh episode. It concluded on May 12, 2016. On March 12, 2014, "The Big Bang Theory" was renewed for an additional three years, extending it through the 2016–17 season for a total of ten seasons. Laura Spencer was upgraded to the main cast during the season as Dr. Emily Sweeney, after being a recurring cast member for two seasons.