space

3. - a large barred spiral galaxy.
5. - when the center of a very massive star collapses in upon itself
6. - A group of stars that form a pattern.
13. - A unit of measurement that's roughly the distance from the Earth to the Sun
14. - a planet the humans live in
15. - A star that's exhausted its own supply of carbon and burnt out
16. - are small, rocky objects that orbit the Sun.

1. - A system of two stars where one revolves around the other or both revolve around a common centre.
2. - the envelope of gases surrounding the earth or another planet.
4. - an object used to fly.
6. - the universe seen as a well-ordered whole.
7. -the star round which the earth orbits.
8. - the curved path of a celestial object or spacecraft round a star, planet, or moon, especially a periodic elliptical revolution.
9. - a collection of stars and planets that are held together by gravity.
10. - person who is trained to travel in a spacecraft..
11. - a celestial body moving in an elliptical orbit round a star.
12. - large objects made of dust and ice that orbit the Sun.