(slang) methamphetamine addiction

(sex, vulgar) vaginal orgasm

in the middle of a conversation; on the other line of the phone

(astronomy) cosmic background radiation

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

xenobiology (speculative biology of extraterrestrial life)

(engineering) aerospace engineering

space probe

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

改正: amendment / 快晴: clear weather / 回生: regeneration / 改姓: family name change