Remembrance of Earth's Past (Chinese: 地球往事; pinyin: Dìqiú Wǎngshì; lit. 'Earth's Past') is a science fiction series by Chinese writer Liu Cixin. The series is also popularly referred to as Three-Body from part of the title of its first novel, The Three-Body Problem (Chinese: 三体; pinyin: Sān Tǐ; lit. 'Three-Body'). The series details humanity's discovery of and preparation for an alien invasion force from the planet Trisolaris. Source: Wikipedia (en)