TOPIK Practice – TOPIK I 어휘 [TOPIK I Vocabulary] 1–5 (8/20/2026) – gj 523b mega earth exoplanet

정답: C. 외계 행성

How to solve: The sentence describes GJ 523b as something located outside our solar system. The term for a planet outside our solar system is '외계 행성' (exoplanet).

A — 위성 (satellite) refers to a celestial body that orbits a planet.

B — 별 (star) is a massive, luminous ball of plasma, like the Sun.

C — 외계 행성 (exoplanet) is a planet that orbits a star other than the Sun, outside our solar system. This fits the context.

D — 우주선 (spaceship) is a vehicle used for space travel.

정답: C. 찾아졌다

How to solve: The underlined word '발견되었다' means 'was discovered' or 'was found'. We need to select the option that has a similar meaning.

A — 관찰되었다 (was observed) means to watch or monitor something.

B — 만들어졌다 (was made/created) means to produce or construct something.

C — 찾아졌다 (was found) has a very similar meaning to '발견되었다' (was discovered). This is the correct answer.

D — 없어졌다 (disappeared/was gone) is the opposite of being found or discovered.

정답: B. 크기

How to solve: The sentence states that GJ 523b is 'about twice as big as Earth'. The blank should refer to the dimension or magnitude of something. '크기' means size.

A — 나이 (age) refers to the duration of existence.

B — 크기 (size) refers to the dimensions or magnitude of an object. This fits the context of being 'two times bigger'.

C — 온도 (temperature) refers to the degree of hotness or coldness.

D — 거리 (distance) refers to the space between two points or objects.

정답: B. 존재할

How to solve: The sentence discusses the 'possibility of liquid water' on the exoplanet. To express that something might be present or exist, '존재할' (to exist) is the appropriate verb.

A — 사라질 (to disappear) means to vanish.

B — 존재할 (to exist, to be present) correctly expresses the possibility of water being there.

C — 없어질 (to be gone, to cease to exist) is the opposite of existing.

D — 변할 (to change) means to become different.

정답: C. 질량

How to solve: The term '거대 지구' (Mega-Earth) implies a planet similar to Earth but significantly larger or more massive. While '크기' (size) is a factor, '질량' (mass) is a primary distinguishing characteristic that makes it 'mega' compared to Earth.

A — 모양 (shape) refers to the external form. Most planets are spherical.

B — 중력 (gravity) is a force related to mass, but '질량' is the more direct characteristic.

C — 질량 (mass) is a fundamental property that defines how much 'stuff' a planet contains and contributes to it being a 'Mega-Earth' (more massive than Earth). This is the correct answer.

D — 자전 (rotation) refers to the spinning motion of a planet on its axis.