“separate belly”: in reference to siblings who share the same father but have different mothers

(relativity) the theory of relativity

(physics) theoretical physics

space probe

Synonym of 天体物理学 (tentai butsurigaku, “astrophysics”)

an astronaut (member of the crew of a spaceship or other spacecraft, or someone trained for that purpose)

xenobiology (speculative biology of extraterrestrial life)

(astronomy) cosmic background radiation

(engineering) aerospace engineering

(Japanese mythology) the protector god of gateways, such as the imperial gate, and one of 瓊瓊杵 (Ninigi)'s crew during his 天孫降臨 (Tenson Kōrin, “Heavenly Grandson's Descent”) to rule the earth