Discussion Questions. From what you know about astronomical units and light-years, how would you define a light-minute? From what you know about astronomical units and light-years, how would you define a light-minute?
1. Scientific notation is used in science because
a. it makes it easy to write large or small numbers.
b. all astronomical distances are expressed in metric units. c. it makes conversions between units easy.
d. all of the above
e. none of the above
2. If light takes 8 minutes to reach Earth from the sun and 5 hours and 18 minutes to reach Pluto, what is the approximate distance from the sun to Pluto?
a. 5.3 AU
b. 40 AU
c. 40 ly
d. 5.3 ly
e. 0.6 ly
3. What does the size of the image of a star in a photograph tell us about the star?
a. the diameter of the star
b. the brightness of the star
c. the mass of the star
d. the temperature of the star
e. the distance to the star
4. An observer on Earth's equator would find
a. Polaris directly overhead.
b. Polaris 40° above the northern horizon.
c. that the celestial equator coincides with the horizon.
d. the celestial equator passing directly overhead.
e. that the ecliptic coincides with the horizon.
5. If the north celestial pole appears on your horizon, what is your latitude?
a. 90° N
b. 90° S
d. 45° N
e. The latitude of the observer cannot be determined from the information given.
6. What is the approximate latitude of the observer in the diagram below?
a. 90° N
b. 90° S
c. 50° N
d. 50° S
7. An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustrations to the right depict photographs taken by the observer, which direction was the camera pointing?
a. straight north
b. straight east
c. straight south
d. straight west
e. straight up, directly overhead
8. The apparent visual magnitude of a star is a measure of the star's