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18. Some objects in space just don?t have what it takes to be a star (just like many hopefuls in Hollywood don?t.) Which of the following is a ?failed star?, an object with too little mass to qualify as a star?

8. Why are astronomers much more interested in the luminosity of a star than its apparent brightness?

3. Which of the following statements about the main sequence stage in the life of a star is FALSE?

1. Which of the following is NOT a correct statement about the ways the jovian planets differ from the terrestrial planets?

12. According to the theory of plate tectonics,

4. What do astronomers think is the origin of the many irregular moons around the outer planets (irregular meaning they are orbiting backwards and/or have eccentric orbits)?

26. Astronomers identify the main sequence on the H-R diagram with what activity in the course of a star’s life?

14. What evidence can you give that shows the surface of Jupiter?s moon Europa must be relatively young?

Calculate the volume (mL) of a 10g/dL of NAOH needed to prepare 1000 mL of 2g/dL of NAOH.

Which of the following is not true as it pertains to the function of the immune system?