On February 18, 1930, Clyde W. Tombaugh, an assistant at the Lowell Observatory in Flagstaff, Arizona, discovered Pluto. For over seven decades, Pluto was considered the ninth planet of our solar system.
Now we know that is not the case.
This video was made by C G P Grey.
Pluto may not be a planet (one less object to memorize in elementary science class!), but it is the basis for some interesting tattoos:
That’s Pluto up there at the top.
Still mourning the fact that Pluto is not a planet? As Neil deGrasse Tyson says, “Get over it!”
Gunsmoke and Knitting 