Information about 21st december 2012

For Your all queries about 21st december 2012
http://www.nasa.gov/topics/earth/features/2012.html

Interesting Info about Pluto and its name

Pluto(right), It is a second largest Dwarf planet. The name Pluto was proposed by an eleven years old young girl Venetia Katherine Douglas Burney(left).
she actually got the word Pluto from the name of a underworld god who can make himself invisible.
she died in 30th April 2009 only..
Originally Pluto was classified as the ninth planet from the sun. 24th august 2006 Pluto was re categorized as a Dwarf planet.

Astronomical unit

1 AU(Astronomical unit) = 149596436542 M
AU is nothing but distance between center point of sun and center point of earth.
This is calculated by the help of speed of light. Sun light takes 8 min 19 sec to reach earth. Speed of light is 299792458 m/s. so 8 min 19 sec is 499 sec. 499 s * 299792458 m/s=149596436542 M (1 AU).