upside down on Instagram: "The solar system is a vast, organized collection of the Sun, eight planets, their moons, and countless smaller objects all bound together by gravity. At the center is the Sun, a massive star that contains more than 99% of all the mass in the solar system and provides the energy that makes life on Earth possible. Closest to the Sun are the rocky inner planets-Mercury, Venus, Earth, and Mars-small, dense worlds with solid surfaces. Beyond them lies the asteroid belt, a r