The five planets which are visible from Earth, using the naked eye, include Saturn, Jupiter, Mars, Venus and Mercury. Because of difference in their orbits, though, it is rare for all of them to be visible in the night sky at the same time, explains National Geographic.
Mercury is the hardest planet to see from Earth, because it sits nearest the sun and never gets that far up in the sky, over the horizon. Saturn resembles a bright star with a yellowish hue. Mars, long known as the red planet, appears as a rust color under the night sky. All five planets appeared in the sky at the same time in the Northern Hemisphere in 2004 and 2012, notes National Geographic.