Each of the words in bold is in the wrong sentence. Write the correct word.

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