Помогите пожалуйста

1. 1) space заменить на system
2) moon заменить на sun
3) planet заменить на star
4) sun заменить на space
5) star заменить на planet
6) planes заменить на rockets
7) наверно, earth заменить на space

Ex 2
2 It is important to send rockets into space.
3 The Earth revolves around the Sun in other orbit, earth is a planet in the solar system.
4 The idea of human life on Mars far -fetched.
5 We have obtained a lot of knowledge about the solar system in recent years.
6 The Earth rotates around the Sun every 365 days.
7 My knowledge of space is very limited. I'd like to know more about it.
8 The Moon is a satellite of the Earth.