STAR CROSSWORD

4. an exploding ball of burning gas held together by gravity
5. shows the relationship between a star's temperature and its luminosity
6. the explosion of a star
8. the amount of light an object emits in a given amount of time.
9. everything that exists—all matter and all energy—throughout space and time
12. allows astronomers to compare the brightness of stars as if they were all the distance of 10 parsecs from Earth
14. The change in the way you hear a noisy object as it moves toward or away from you
17. small, rocky bodies that orbit, or travel around, the sun

1. A type of wave that transfers energy
2. assigns a value, or number, to the brightness of each object in the sky that we can see from Earth
3. A cloud of gas and dust that occurs in the space between the stars
7. how astronomers explain the way the universe began
10. any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave
11. a group of stars that form a band on a graph of their color versus their brightness
13. a 'shift' of light waves traveling away from Earth
15. large objects made of dust and ice that orbit the Sun
16. a huge collection of gas, dust, and billions of stars and their solar systems