Book cover of The Three-Body Problem. [Photo/Scifinow.co.uk]

The English edition of The Three-Body Problem by Liu Cixin has sold more than 110,000 copies worldwide since its debut over a year ago.

The figure was released by the book's English copyright holder today.

The first part of the Three-Body trilogy, translated into English by Chinese-American writer Ken Liu, won the 2015 Hugo Award for Best Novel, and has made more than $2 million.

The other two books are The Dark Forest and Death's End.

The trilogy depicts the story of an alien invasion of Earth while the first book, The Three-Body Problem, centers on a secret military project that enables humans to establish contact with the aliens who teeter on the edge of extinction.

The trilogy has sold more than 1 million copies in China.

Liu Cixin was the first Asian writer to win the Hugo Award, generally considered the highest honor for sci-fi works.

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