10. An astronomer wants to observe a cloud of cold neutral (not ionized) hydrogen, far away from any stars. What would be an instrument that could help in this task?

24. What do the surveys of the three-dimensional distribution of groups of galaxies reveal about how groups and clusters of galaxies are organized?

15. Objects orbiting around the center of the Milky Way obey Kepler’s 3rd Law. This means that:

23. The element that can act like a metal when it is under tremendous pressure and is probably responsible for Jupiter and Saturn’s magnetism is:

11. A star whose temperature is increasing but whose luminosity is roughly constant moves in what direction on the H-R diagram?

12. Which of the following statements about the different types (shapes) of galaxies is correct?

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?

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)?

48. Why do different types of atoms (elements) give off or absorb different spectral lines?

20. Which statement about the Sun?s rotation is TRUE?