3. Earth-Moon System: Earth
Earth is the third planet from the Sun and the fifth largest in the solar system. Earth's diameter is just a slighly larger than that of Venus. The four seasons are a result of Earth's axis of rotation being tilted more than 23 degrees.
Earth is an ocean planet. Our home world's abundance of water - and life - makes it unique in our solar system. Other planets, plus a few moons, have ice, atmospheres, seasons and even weather, but only on Earth does the whole complicated mix come together in a way that encourages life - and lots of it.
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