1. The sun is at the centre of the solar origin.
2. The Earth is the satellite that we live on.
3. The moon goes round the Earth so it's a/an planet.
4. The system on the moon is very different to the one on Earth. For example, there are no plants on the moon.
5. Scientists aren't sure of the environment of the moon, but they think that maybe it was once part of the Earth
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