Instruct: Given a question, retrieve relevant passages that answer the question.
Query: When did The Big Bang Theory first air on television?
The first season of the American sitcom The Big Bang Theory was originally aired on CBS from September 24, 2007, to May 19, 2008, over 17 episodes. An unaired pilot also exists. The Season 1 DVD came without a gag reel and is, so far, the only Big Bang Theory DVD set not to have one. The reissued Blu-ray, was released July 10, 2012, and includes a gag reel that is exclusive to the set. The episodes on Blu-ray are all in remastered surround sound, whereas the DVD version had stereo. Two of the main cast, Sheldon and Leonard, are named after actor, director, and producer Sheldon Leonard.[1]
The first and second pilots of "The Big Bang Theory" were directed by James Burrows, who did not continue with the show. The reworked second pilot led to a 13-episode order by CBS on May 14, 2007. Prior to its airing on CBS, the pilot episode was distributed on iTunes free of charge. The show premiered on September 24, 2007, and was picked up for a full 22-episode season on October 19, 2007. The show is filmed in front of a live audience, and is produced by Warner Bros. Television and Chuck Lorre Productions. Production was halted on November 6, 2007, due to the Writers Guild of America strike. Nearly three months later, on February 4, 2008, the series was temporarily replaced by a short-lived sitcom, "Welcome to The Captain". The series returned on March 17, 2008, in an earlier time slot and ultimately only 17 episodes were produced for the first season.
The fifth season of the American sitcom "The Big Bang Theory" was originally aired on CBS from September 22, 2011, to May 10, 2012, over 24 episodes.
Detailed observations of the morphology and distribution of galaxies and quasars are in agreement with the current state of the Big Bang theory. A combination of observations and theory suggest that the first quasars and galaxies formed about a billion years after the Big Bang, and since then, larger structures have been forming, such as galaxy clusters and superclusters.
The TNT brand returned to the Spanish market in the summer of 2007, when it launched exclusively on pay television platform Digital+. , TNT is available on several subscription providers in Spain. TNT España is divided in two blocks: one exclusively carrying movies and another exclusively carrying television series (such as "The Vampire Diaries", "The Big Bang Theory", "Two and a Half Men", "Falling Skies" and "Sherlock"). In 2019, TNT España aired the first series they commissioned locally in Spain, "Vota Juan".
The third season of the American sitcom "The Big Bang Theory" was originally aired on CBS from September 21, 2009 to May 24, 2010 with 23 episodes. It received higher ratings than the previous two seasons with over 15 million viewers. Season three started three months after the end of season two when the guys left for the North Pole.
In November 2016, it was reported that CBS was in negotiations to create a spin-off of "The Big Bang Theory" centered on Sheldon as a young boy. The prequel series, described as "a "Malcolm in the Middle"-esque single-camera family comedy" would be executive-produced by Lorre and Molaro, with Prady expected to be involved in some capacity, and intended to air in the 2017–18 season alongside "The Big Bang Theory". The initial idea for the series came from Parsons, who passed it along to "The Big Bang Theory" producers. In early March 2017, Iain Armitage was cast as the younger Sheldon, as well as Zoe Perry as his mother, Mary Cooper. Perry is the real-life daughter of Laurie Metcalf, who portrays Mary Cooper on "The Big Bang Theory".
The eighth season of the American sitcom "The Big Bang Theory" first aired on CBS with a one-hour premiere on Monday, September 22, 2014. It returned to its previous Thursday time slot on October 30 for the season's seventh episode. It concluded on May 7, 2015. 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.
In Canada, "The Big Bang Theory" aired on CTV Television Network. The season premiere ("The Skank Reflex Analysis") garnered 3.72 million viewers and the finale was watched by 4.04 million households. Most episodes were the most watched programme in Canada that week. The highest rating in season 5 was 4.05 million, for "The Infestation Hypothesis", and the lowest rating was 3.17 million, for "The Stag Convergence".
The Big Bang Theory initially received mixed reviews, receiving 52% "rotten" score on review aggregator Rotten Tomatoes, based on 23 reviews, with the critics consensus reading "The Big Bang Theory brings a new class of character to mainstream television, but much of the comedy feels formulaic and stiff."[29] It also received a 57-point score on review aggregator Metacritic, indicating "mixed or average reviews", based on 23 reviews.[30]
The programming block's name is a portmanteau of The Big Bang Theory, the American sitcom from CBS that will play during the block, and Hockey Night In Canada, a show that airs on CBC Television during that same time block. Due to the NHL strike, CBC is only broadcasting previous games instead of those of the now-cancelled 2012-2013 season. Likewise, "Big Bang Night in Canada" also plays reruns of previous episodes. Unlike "Hockey Night", new Big Bang episodes do play every Thursday at 8 ET/PT, but they are not branded as "Big Bang Night".
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.
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.
Though the Big Bang theory was met with much skepticism when first introduced, it has become well-supported by several independent observations. However, current physics can only describe the early universe from 10 seconds after the Big Bang (where zero time corresponds to infinite temperature); a theory of quantum gravity would be required to understand events before that time. Nevertheless, many physicists have speculated about what would have preceded this limit, and how the universe came into being. For example, one interpretation is that the Big Bang occurred coincidentally, and when considering the anthropic principle, it is sometimes interpreted as implying the existence of a multiverse.
In "The Big Bang Theory", the song is described by Sheldon as a song sung by his mother when he is ill. The lyrics on "The Big Bang Theory" are: "soft kitty, warm kitty, little ball of fur! Happy kitty, sleepy kitty, purr purr purr!" A scene depicting the origin of the song in Sheldon's childhood is depicted in an episode of "Young Sheldon", the prequel series to "The Big Bang Theory". This aired on February 1, 2018, and shows Sheldon's mother Mary singing the song to her son, who is suffering with the flu.
The American television sitcom "The Big Bang Theory", created and executive produced by Chuck Lorre and Bill Prady, premiered on CBS on September 24, 2007.
The sixth season of the American sitcom "The Big Bang Theory" aired on CBS from September 27, 2012, to May 16, 2013. 
"The Big Bang Theory" started off slowly in the ratings, failing to make the top 50 in its first season (ranking 68th), and ranking 40th in its second season. When the third season premiered on September 21, 2009, however, "The Big Bang Theory" ranked as CBS's highest-rated show of that evening in the adults 18–49 demographic (4.6/10) along with a then-series-high 12.83 million viewers. After the first three seasons aired at different times on Monday nights, CBS moved the show to Thursdays at 8:00 ET for the 2010–2011 schedule, to be in direct competition with NBC's Comedy Block and Fox's "American Idol" (then the longest reigning leading primetime show on U.S. television from 2004 to 2011). During its fourth season, it became television's highest rated comedy, just barely beating out eight-year champ "Two and a Half Men". However, in the age 18–49 demographic (the show's target age range), it was the second highest rated comedy, behind ABC's "Modern Family". The fifth season opened with viewing figures of over 14 million.
The twelfth and final season of the American television sitcom The Big Bang Theory premiered on CBS on September 24, 2018.[1][2] The series returned to its regular Thursday time slot on September 27, 2018.
"The Big Bang Theory" is an American comedy television series created and executively produced by Chuck Lorre and Bill Prady. Like the name of the series itself (with the exception of the first episode "Pilot"), episode titles of "The Big Bang Theory" always start with ""The"" and resemble the name of a scientific principle, theory or experiment, whimsically referencing a plot point or quirk in that episode.
Ferris explains in the beginning of his book the cosmological model as it has arrived to us today from ancient philosophy. He then goes into quantum physics, deep explanations of the Big Bang Theory and that "space" and matter in the Big Bang theory were able to move faster than the speed of light. He further explains that "space" itself was being created at the same time as its astronomical objects therein. These objects and "space" together were expanding at this speed greater than light, at least for the first fraction of a second. Ferris writes for the reader to understand that "space" was "created" in the Big Bang and did "not" preexist. He explains that all "space" and matter in the universe were in a "singularity" before the Big Bang even started. This means a "curvature of spacetime" that's immeasurably large.
The fourth season of the American sitcom "The Big Bang Theory", began airing on CBS on September 23, 2010. Season four started four months after the end of season 3.
The history of the Big Bang theory began with the Big Bang's development from observations and theoretical considerations. Much of the theoretical work in cosmology now involves extensions and refinements to the basic Big Bang model.
Sheldon Lee Cooper, Ph.D., Sc.D., is a fictional character in the CBS television series "The Big Bang Theory" and its spinoff series "Young Sheldon", portrayed by actors Jim Parsons in "The Big Bang Theory" and Iain Armitage in "Young Sheldon" (with Parsons as the latter series' narrator). For his portrayal, Parsons has won four Primetime Emmy Awards, a Golden Globe Award, a TCA Award, and two Critics' Choice Television Awards. The character's childhood is the focus of "Young Sheldon": the series' first season is set in 1989 when nine-year-old prodigy Sheldon has skipped ahead five grades, to start high school alongside his older brother.
The second pilot of The Big Bang Theory was directed by James Burrows, who did not continue with the show. This reworked pilot led to a 13-episode order by CBS on May 14, 2007.[5] Prior to its airing on CBS, the pilot episode was distributed on iTunes free of charge. The show premiered September 24, 2007, and was picked up for a full 22-episode season on October 19, 2007.[6]