Blue Space

Blue Space, a stellar-class battleship belonging to the Asian Fleet in Liu Cixin's science fiction novels *The Three-Body Problem II: The Dark Forest* and *The Three-Body Problem III: Death's End*, was captained by Cheng Yan, and equipped with a fusion propellant-less radiation engine, reaching a maximum speed of 15% of the speed of light [1-2]. This ship, along with five warships including Natural Selection and Ultimate Law, formed Starship Earth, becoming the spark for the continuation of human civilization after the Battle of Doomsday [3]

In the Dark Battle, Blue Space resisted Ultimate Law's infrasound hydrogen bomb attack using a vacuum defense, then counterattacked, causing its explosion, and received resources from Enterprise, Deep Space, and Natural Selection [1] [3]. During its escape from the solar system, it encountered Gravity and the droplet in pursuit, used fragments of four-dimensional space to destroy the droplet and hijack Gravity, and the two ships jointly activated the gravitational wave broadcast. Finally, merging with Gravity, they totaled 1415 people and developed new planets to continue human civilization [2] [4]