The approximate diameters of Saturn and Uranus are listed below:
Saturn: 1, point, 2, 1, times, 10, to the power 5 1.21×10
5
kilometers
Uranus: 5, point, 1, 1, times, 10, to the power 4 5.11×10
4
kilometers
What's the difference between the diameters of the two planets? Express your answer using either standard notation or scientific notation.