The Planets

All planets in our solar system rotate on their axes and revolve around the sun. There are eight planets that are classified as such with no contest and nine including Pluto which was recently demoted to a dwarf planet. The planets listed in order go Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Scientist are constantly searching for new planets and debating on what is classified as a planet and what is not.


History of The Planets

People first believed that the Earth was the center of the universe and that all things revolved around it. This theory is called the geocentric model or the Ptolemaic model. Only three of the planets require a good telescope to see which means only 3 of the planets have discoverers. The first Planet discovered with a telescope was Uranus by Sir William Herschel in 1781. The second was Neptune discovered by John Couch Adams in 1846. In 1930 the tiny dwarf planet Pluto was discovered by Clyde Tombaugh. Now with the help of new technology small discoveries are made more often and go less noticed.

Application of The Planets

The exploration of the planets expand our knowledge of our solar system. The development of new spaceships might one day allow us to gain resources from outside of our own planet. If this were to happen we would need to know information about the planets that surround us. This exploration could even lead to finding a new Planet capable of human life.


  1. Beiser, A. (1988). Physical Science (2nd Edition). New York, NY: McGraw Hill
  3. Daniels, Patricia. (2009). The New Solar System. Washington DC: National Geographic

This WikiPage developed by Charles Gray - 2011FA