planet

惑星

地球や火星など、太陽の周りを回る八つの大きな天体の一つ。

やさしい英語で： One of the eight large worlds that travel around the Sun, including Earth and Mars.

• Earth is our planet.
• Mars is often called the red planet.
• Eight planets travel around the Sun.

よく使う表現： planet Earth, red planet, our planet

惑星

恒星の周りを回り、恒星のように自ら光らない大きくほぼ丸い天体。

やさしい英語で： A large, nearly round object in space that travels around a star and does not shine like one.

• A planet travels around a star.
• Astronomers discovered three planets around that distant star.
• This rocky planet may have liquid water.

類義語： world

よく使う表現： distant planet, rocky planet, giant planet