Stars

2. It is a ray that would travel in a vacuum in one year.
4. What is the first name of Hertzsprung?
7. What is the first name of the man who studies the relationship of spectral class and magnitude?
8. It is a more common star than a supergiant.
10. It is a matter in a gas cloud will begin to condense inta a dense region.
13. It is how bright a star actually is.
14. It is a magnitude that tells how bright the star appears to be on earth.
15. What is a star that has a diameter of about 0.1 of diameter of the sun.

1. Who is the guy who studied the relationship of absolute magnitude and color?
3. It is how stars is classified.
5. It is the class G of stars.
6. What is a large celestial composed of hot gasses contained by gravity?
9. It is the measure of brightness of celestial objects.
11. What color is a star when it's temperature is 20,000-60,000K?
12. It is now refers to a well defined region of the sky that contains the traditional star pattern.