English language
Published Sept. 6, 2016
George's Secret Key Hardcover Collection
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George's Cosmic Treasure Hunt is a 2009 children's book written by Stephen and Lucy Hawking. George and Annie, the middle-school cosmologists, return in this sequel to the 2007 story, George's Secret Key to the Universe. The book was followed by George and the Big Bang in 2011, George and the Unbreakable Code in 2014, George and the Blue Moon in 2016 and George and the Ship of Time in 2018.