The Sun and Stars

1. the brightness of a star from earth.
3. the outer-most layer of the interior.
4. any massive self-luminous celestial body of gas.
8. a large, bright, gaseous feature extending outward from the Sun's surface, often in a loop shape.
10. Cool areas that appear dark on the surface of the Sun.
12. the outer atmosphere of the Sun.
13. a sudden flash of increased brightness on the Sun.
14. the distance from the earth to the sun the star around which the earth orbits.
15. the section of the solar interior between the innermost core and the outer convective zone.

2. a distinctive band of stars that appears on plots of stellar color versus brightness.
5. the brightness of a star.
6. the sun's lower gaseous atmosphere.
7. the visible "surface" of the Sun.
8. what the sun is almost entirely made of.
9. the central region made of plasma.
11. the color of stars represents_______.
12. huge bubbles of coronal plasma threaded by intense magnetic field lines.