In the heliocentric model of the universe, our Sun is at the center of a solar system, orbited by the planets in the order of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Due to this arrangement, as you can see in the following image, since Mercury and Venus are situated closer to the Sun than the Earth, an observer on Earth would have to always be facing the Sun in order to view them. If an Earth observer was on the dark half facing away from the Sun, it would of …