Talk about the Book of the Month, Discover Magazine, and get extra marks!
How would they do that...measure the diameter of Pluto? Wouldn't that be hard...haha I don't think that they would have to walk the whole length of Pluto and measure it. But how else would they be able to do it?
Go to http://www.gps.caltech.edu/~mbrown/planetlila/
Website http://www.caouette31.4t.com