Galaxies Review

2. The Milky Way galaxy is a __________________ galaxy.
4. The force that governs the motion of celestial objects in Earth’s solar system, keeps planets in orbit around the sun, and plays a key role in maintaining the structure of the Milky Way galaxy
6. A star forms in a giant gas cloud called a stellar ____.
7. A galaxy with an oval or round shape containing mostly older stars
9. A galaxy with an undefined shape containing both younger and older stars
10. Earth's solar system is located on the outer spiral ________
11. Quadrant two's stars are cool and _____________.
14. This quadrant's stars are hot and bright
15. A galaxy with a disk shape, spiral arms, and a central bulge containing mostly younger stars
17. Quadrant three's stars are ________ and dim.

1. A system of gas, dust, planets, and millions or billions of stars
3. A star's ________ class indicates its temperature and color
5. A star's ________ is usually plotted on the x-axis and increases from right to left on the diagram
8. A star's ________ is usually plotted on the y-axis and increases from bottom to top on the diagram
12. This quadrant's stars are cool and dim
13. The black hole is one of the final stages of a _______ mass star.
15. A ____________ is a ball of hot gas that emits light through the process of nuclear fusion
16. The white dwarf is the final stage of a _________ mass star.