Did you know that there are eight planets in our Solar System? Pluto is a dwarf planet but is not included in the eight because it is too small. Neptune orbits the sun every 164.8 years and the Sun is 300,000 times bigger than the Earth! Did you know that asteroids are made of small, air less, rocky worlds, spinning round the Sun but too small to be called a planet or a dwarf planet? There is a comet called Halley’s Comet that was last seen in 1986 but maybe seen again in 2061, (hopefully it will ). Scientists think that the Solar System was formed about 4.6 billion years ago.