亜あ光こう速そく

noun

near light speed; sublight speed

Technical term used in physics and science fiction to describe speeds close to, but below, the speed of light.

• 亜あ光こう速そくで移い動どうできる宇う宙ちゅう船せんの設せっ計けいが研けん究きゅうされている。

  Designs for spacecraft capable of traveling at near light speed are being researched.

• SF小しょう説せつでは、亜あ光こう速そく航こう行こうがよく登とう場じょうする。

  Sublight travel often appears in science fiction novels.