TOEFL 어휘

cloud of gas and dust in space

성운

joining light atomic nuclei into heavier nuclei

핵융합

move along a gravitationally bound path

궤도를 돌다; 공전하다

move repeatedly about an equilibrium position

진동하다; 앞뒤로 반복해서 흔들리다

moving component fitting inside a cylinder

피스톤

major nearly round body orbiting a star

행성

energy associated with position or configuration

위치 에너지

rate of energy transfer or work

일률; 출력

grooved wheel guiding a rope or belt

도르래; 벨트 풀리

send incident light back from a surface

반사하다

change light direction through change of optical medium

굴절하다; 굴절시키다

strengthen a structure with added support or material

보강하다; 구조를 강화하다

exert a force pushing an object away

밀어내다; 척력을 발생시키다

turn about an axis

회전하다; 회전시키다

turning motion about an axis

회전; 자전

ratio of capacity to expected demand in design

안전 계수

natural or artificial object orbiting a larger body

위성

moon blocks part or all of sun from observers view

일식

sun and objects gravitationally associated with it

태양계

mechanical disturbance traveling through a medium

소리; 음

vehicle designed to travel or operate in space

우주선

rate of distance traveled without direction

속력; 속도의 크기

self gravitating luminous body sustained by fusion during active life

별; 항성

force or action that a structure must support

구조 하중

powerful stellar explosion

초신성; 초신성 폭발

instrument collecting radiation from distant objects

망원경

pulling force transmitted through a stretched member

장력; 인장력

planet with a rocky solid surface

지구형 행성; 암석형 행성

turning effect of a force about an axis

토크; 돌림힘