Astronomy

5. A constellation that can be used to locate the direction south in the night sky.
10. The final stage of an extremely massive star's life cycle.
11. The brightness of a star as it appears from Earth.
15. The unit to measure distance in space.
16. The final stage of a fairly massive star's life cycle.
18. A medium sized star that is the centre of our solar system.

1. The imaginary central point in the night sky that the stars appear to be rotating around.
2. A cluster of stars that form a pattern in the sky.
3. The imaginary line that the sun, moon, planets and twelve constellations pass through.
4. The actual brightness of a star.
6. The main gas that stars are composed of.
7. The theory that proposes the universe has always existed.
8. A massive star that is cooling and expanding as it begins to run out of gas.
9. A huge cloud of gas and dust that forms a star.
10. The theory that proposes that the universe is expanding.
12. The longest stage of a star's life cycle.
13. When our Sun eventually runs out of gas it will shrink and form this type of star.
14. When nuclear fusion occurs on a star hydrogen is converted into this gas.
17. An explosion after a massive star begins to run out of gas.