We have discovered many things from exploring them. From hot Venus to freezing cold Pluto, we have tons of information of the planets and how we have explored them. From the nearest planet from the Sun, Mercury, to the farthest planet from the Sun, Pluto, and the largest planet, Jupiter, to the smallest planet, Pluto, there is not one planet that does not have something interesting about it. Mercury has the largest temperature range. Venus is the hottest planet.
Earth has life on it.
Mars has a rocky red surface. Jupiter is the largest planet. Saturn has rings. Uranus has a horizontal axis not a vertical axis. Pluto is extremely cold.