Our solar system is made up of the Sun and everything that orbits around it, including eight planets. The planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Earth is the third planet from the Sun and is the only known planet that can support life. The Earth spins on its axis, causing day and night, and orbits the Sun once a year, causing the changing of seasons as the Earth's distance from the Sun varies over the course of the year. Other objects in our solar system include asteroids, meteoroids, and comets.