String versus Planck length

The strings in string theory are unimaginably small. The average string if it exists, is about 10 to the minus 33 centimeters long. That's a millionth of a billionth of a billionth of a billionth of a centimeter. In comparison if an atom were magnified to the size of the solar system a string would be the size of a tree. Now if you think that's small a Planck length is even smaller at 10 to the minus 35 millimeters. To give an example of this length, if a football field were magnified to the size of the observable universe a Planck length would be the size of an atom.