jan 21, 2006 - Pluto is downgraded to a drawft planet
Description:
The International Astronomical Union downgraded Pluto to be a Dwarf PlanetThe significance of this is that new textbooks now have to be made to say that Pluto is not a planet.
My Sources:
Added to timeline:
Date:
jan 21, 2006
Now
~ 19 years ago