Up until recently, that was the Solar System -- four Earth-like planets with small radius, smaller than about two times the size of the Earth -- and that was of course Mercury, Venus, Mars, and of course the Earth, and then the two big, giant planets.
最近までは太陽系は 地球の約２倍までの大きさの 小型の地球型惑星が４つで それはもちろん水星と 金星 火星 当然 地球も入ります それから巨大惑星が２つ