Across
- 5. measure of distance of planets relative to the Sun
- 8. day and night are equal in length
- 9. Earth-centred solar system
- 10. a force pulling you to the centre of the Earth
Down
- 1. use to measure stars hight over the horizon
- 2. sun-centred solar system
- 3. people who travel to space
- 4. sun reaching the highest/lowest point in the sky
- 6. lack of gravitational force
- 7. the universe