Masa pamintului: Mp = 5977 * 10^24 kg
Masa lunii: Ml = 7347 * 10²² kg
Mp / Ml = (5977 * 10^24) / (7347 * 10²²) = 5977 * 100 / 7347 = 81.35
Mp / Ml = 81.35
Mp - Ml = 5977 * 10^24 - 7347 * 10²² = (5977 - 73.47) * 10^24 = 5903.53 * 10^24
Mp - Ml = 5903.53 * 10^24 kg