the diameter of the planet mercury is 4.87x10^3
the diameter of the planet venus is 1.21x10^4
the diameter of the planet earth is 1.28x10^4
the diameter of the planet mars is 6.79x10^3
Ordering the planets from smallest to largest diameter:
1. Mercury: 4.87x10^3
2. Mars: 6.79x10^3
3. Earth: 1.28x10^4
4. Venus: 1.21x10^4