The universe

1. an object that orbits a planet or something else that is not a star
5. how astronomers explain the way the universe began
7. a cloud of gas and dust in outer space
10. large objects made of dust and ice that orbit the Sun
11. there are 8 in the solar system
12. a mineral found in plants and animals and all living things
13. a planet that have roughly the size of Mars, which is thought to have collided with the proto-Earth, ejecting material into orbit to form the Moon
14. dusty material found between the stars
16. a whirling mass of gas that rotates around a star and is believed to become a planet

2. a regular, repeating path that one object in space takes around another one.
3. the totality of existence
4. a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
6. a small rocky body orbiting the sun
8. the explosion of a star
9. an invisible force that pulls objects toward each other
15. a fixed luminous point in the night sky which is a large