Question: Which of the following statements does not use the term light-year in an appropriate way? (**** is correct)

Answer:

Question: One light year is about 10 trillion kilometers. T or F?

Answer: True.

Question: Suppose we imagine the Sun to be about the size of a grapefruit (about 10 cm across). What describes the size and distance of Earth on the same scale?

Answer: Earth is the size of a poppy seed about 10 meters away from the Sun.

Question: Which of the following is smallest? (**** is correct)

Answer: 1. 1 AU

2. 1 light-second

3. size of a typical star

4. size of a typical planet****

Question: Which of the following is largest? (**** is correct)

Answer: 1. size of Pluto’s orbit

2. size of a typical galaxy****

3. 1 light-year

4. distance to the nearest star (other than our Sun)

Question: If traveling at the speed of light, approximately how far could you travel in one second?

Answer: 7x around the Earth

Question: How far from Earth is the Moon?

Answer: 1 light second

Question: How far from Earth is the Sun?

Answer: 8.3 light minutes

Question: How far from Earth is the nearest star besides the Sun?

Answer: 4.2 light years

Question: What is the ecliptic plane?

Answer: the plane of Earth’s orbit around the Sun