The diameter of Neptune is \( 5.0 \times 10^{4} \mathrm{~km} \) The diameter of Mars is \( 6.8 \times 10^{3} \mathrm{~km} \) Calculate the difference between the diameter of Neptune and the diameter of Mars. Give your answer in standard form.

To find the difference between the diameters of Neptune and Mars, we first convert their diameters to the same format for easy calculation. Diameter of Neptune: \( D_N = 5.0 \times 10^{4} \, \text{km} \) Diameter of Mars: \( D_M = 6.8 \times 10^{3} \, \text{km} \) We can express \( D_M \) in the same power of ten as \( D_N \): \( D_M = 0.068 \times 10^{4} \, \text{km} \) Now, we subtract the two: \[ D_N - D_M = (5.0 \times 10^{4} \, \text{km}) - (0.068 \times 10^{4} \, \text{km}) \] \[ = (5.0 - 0.068) \times 10^{4} \, \text{km} \] \[ = 4.932 \times 10^{4} \, \text{km} \] So, the difference between the diameter of Neptune and the diameter of Mars is \( 4.932 \times 10^{4} \, \text{km} \).