![]() One unique planetary system-a star with planets surrounding it-is our solar system. ![]() How Many Solar Systems are There in the Universe? It emits the majority of the heat and light that allow life to exist on Earth and potentially beyond. SUN: The biggest star in our solar system, accounting for 99.8% of its mass. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune are the eight planets. Planets circle the Sun in elliptical orbits, with the Sun slightly off-centre of each ellipse. The asteroid belt contains the majority of these objects, which orbit between Mars and Jupiter. ![]() The solar system also contains asteroids, which are tiny irregularly shaped objects composed of rock, metal, and carbon that circle the Sun. These planets are much larger than the rocky worlds. Gas Giants: Jupiter, Saturn, Uranus, and Neptune are composed primarily of gases such as hydrogen, helium, and methane. ![]() Rocky Planets: Mercury, Venus, Earth, and Mars are largely formed of solid rock and metal. Planets originated at least 4.6 billion years ago when dust and gas discs circling the Sun collided and clumped together owing to gravity. The Earth is also a planet, and it is far enough away from the Sun that it is neither too hot nor too cold for life to survive. The solar system also includes eight planets, which are enormous, almost spherical objects that round the Sun in elliptical trajectories known as orbits. ![]()
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