Stars

3. This stage in a star's life cycle happens when a star starts fusing helium into carbon, and the outer layers of the star expand. (2 Words)
6. These are groups of stars that form patterns
9. This is the amount of starlight received on Earth. (2 words)
11. The hot, dense core leftover after the gases in a planetary nebula escape. (Two Words)
13. What is formed a massive star's core collapses to a single point. (2 Words)
15. This is when the outer layers of a star explode.
16. Relatively cool stars look either orange or this color.
17. This is a cloud of gas, ice, and dust that can form stars.

1. This is the unit used to measure the temperature of stars.
2. Scientists study these to understand the composition of stars.
4. This is the actual amount of light that a star gives off. (Two Words)
5. This is another name for the North Star.
7. This is the brightest star in our sky.
8. What is formed when a massive star's core collapses to approximately 20km in diameter, and is composed of only neutrons. (2 Words)
10. Our Sun is a star of this color.
12. The first element fused in the core of stars.
14. This is the apparent shift in position of an object when viewed from two different positions. And is used to measure the distance to stars.