1. Short period comets orbit the Sun every twenty years or less, whereas long period comets orbit the Sun every 200 years or longer
2. A comet is said to reach perihelion when its orbit brings it closest to the sun
3. The Bayeux Tapestry depicts Halley’s comet during its 1066 appearance
4. Comet ISON originates from the Oort Cloud; a huge reservoir of comets on the edge of our solar system. It is named after Dutch astronomer Jan Hendrik Oort
5. Less than 1% of comets spontaneously disintegrate for no apparent reason!