Determining Terrestrial Planet Orbital Periods. Access the animation “Planetary Orbits” in Chapter 5 of the Discovering the Universe Web site. Focus on the motions of the inner planets during the last...

Determining Terrestrial Planet Orbital Periods. Access the animation “Planetary Orbits” in Chapter 5 of the Discovering the Universe Web site. Focus on the motions of the inner planets during the last half of the animation. Using the stop and start buttons, determine how many days it takes Mars, Venus, and Mercury to orbit the Sun once if it takes Earth approximately 365 days.