Chapter 13

6. the suns outer atmosphere
8. growing is a visible spectrum
10. dark spots on the suns surface
11. type of a neutron star that beams out light and very high-energy radio wave
13. the brightness a star as it appears in the night sky
14. brief expulsion of large quantities of gas and charged particles produced by rapidly changing magnetic fields around sunspots
15. imaginary line from which the distance to an object is measured

1. huge arching line of gas, approximately 100 billion tonnes of glowing hydrogen
2. ionized gas emitted from the sun continuously
3. star star stage after the collapse of a massive star
4. object either of known brightness or predictable behaviour that astronomers can use to determine distance
5. a layer of somewhat thinner gases at 60,000c that makes the inner atmosphere
7. distance that light travels in a year
9. refers to the actual amount of light a star gives off
12. apperent motion of a star against the background of more distant stars