If you lived on Mars and observed the solar system from there, would describe retrograde loops, would always be seen near the sun, and would never be visible as crescent phases. (We are limiting responses to the five planets you could see with the naked eye from Mars, which are Mercury, Venus, Earth, Jupiter, and Saturn.) Hint: From Earth, all the other planets show retrograde motion; Mercury and Venus are always near the sun; and Mars, Jupiter, and Saturn are never visible as crescents.