The Sun, The Moon and 11 Planets
« on: March 09, 2012, 11:27:01 AM »
Many scientists believe Pluto is a planet despite the fact that the International Astronomical Union (IAU) has reclassified it as a dwarf planet. From 1930 until 2006 it was classified as the 9th planet orbiting the sun. Interestingly in 2005 the 9th largest celestial body orbiting the sun was discovered, Eris.
Eris, formal designation 136199 Eris, is the most massive known dwarf planet in the Solar System and the ninth most massive body known to orbit the Sun directly. It is estimated to be approximately 2300–2400 km in diameter, and 27% more massive than Pluto or about 0.27% of the Earth's mass. Eris was discovered in January 2005 by a Palomar Observatory-based team led by Mike Brown, and its identity was verified later that year.
So, in the pre-2006 world when Pluto was classified as a planet, Eris would have been classified as the 10th planet. After finding this out today I personally think Pluto should not have been downgraded. If we take this method of counting the planets, then Planet-X would be the 11th planet orbiting our sun.
"Behold! Joseph said to his father: "O my father! I did see eleven planets and the sun and the moon: I saw them prostrate themselves to me!"