Space

3. an icy, small Solar System body that warms and begins to release gases when passing close to the Sun
5. everything. It includes all of space, and all the water and energy that space contains
6. the way astronomers explain the universe began
9. a dying star
12. small particles of matter floating through space that are believed to make up all matter in universe
13. a regular, repeating path that one object in space takes around another one
14. a large body of matter in orbit around the sun or a star and thought to be developing into a planet
15. hard, dark, grey metal

1. the natural satellite of the earth
2. an enormous cloud of dust where new stars are born
4. ancient planet in the early solar system that collided with the earth 4.5 billion years ago
7. the force that attracts a body towards the centre of the earth, or towards any other physical body having mass
8. a small rocky body orbiting the sun
10. a huge collection of gas, dust, and billion of stars and their solar systems, all held together by gravity
11. a natural luminous body visible in the night sky
14. any large sphere shaped bodies that orbit around a sun