1. Which object is most similar to Venus in mass and diameter? a. Earth b. Mars c. Mercury d. our Moon 2. Why is Mercury so difficult to observe? When is the best time to see the planet? (Hint: Guided...

1. Which object is most similar to Venus in mass and diameter? a. Earth b. Mars c. Mercury d. our Moon

2. Why is Mercury so difficult to observe? When is the best time to see the planet? (Hint: Guided Discovery: The Inner Solar System, on page 188, can help.)

3. Compare the surfaces of Mercury and our Moon. How are they similar? How are they different?