2.4 Review

1. How can you tell the difference between a planet and a star in the night sky?

A. each night you can see planets moving among the constellations of stars
B. over many nights you can see planets moving among the constellations of stars
C. planets are always brighter than stars
D. planets are always red in color

2. Why do we have 7 days in a week?

A. Because ancient people recognized 7 objects that move through the constellations of stars in the sky
B. Because there were 7 wonders in the ancient world
C. Because 7 was considered a lucky number
D. Because although we now know that 8 planets (including Earth) orbit the Sun, ancient people thought that only 7 planets orbited the Sun.

3. Which statement correctly describes what is we see in the sky during the time that a planet is in its period of apparent retrograde motion?

A. The planet is getting very close to the Sun on the celestial sphere.
B. Over a single night, the planet traces out a small loop relative to the stars in the sky.
C. The planet appears to rise in the west and set in the east, rather than the usual rising in the east and setting in the west.
D. Over many days or weeks, the planet moves westward relative to the stars, rather than the usual eastward relative to the stars.

4. Which statement correctly describes what is really going on in space during the time that we see Mars is in its period of apparent retrograde motion in our sky?

A. Mars is moving around the Sun in the opposite direction from which Earth is moving around the Sun.
B. Earth and Mars are getting closer together throughout this entire period.
C. Earth is catching up with and passing by Mars in its orbit.
D. Earth and Mars are on opposite sides of the Sun.

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