Solar system is composed (primarily) of Sun and a number of planets that revolve around it. These planets include (in order of distance from Sun), Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Until very recently, Pluto was also considered a planet, but has been removed from that designation. Other constituents of solar system include, moons of planets (such as our moon and those of Jupiter), asteroids, comets, gases, etc. Sun's gravity keeps all these components in the solar system. The solar system gets its name due to the presence of Sun (other similar terms are solar flares, solar day, etc.). The solar system is very old, in fact, it is billions of years old. Our own Earth is more than 3 billion years old.
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