سرعت فرار از ماه هم برابر: 2.38 km/s
پس ماهواره، باید بدون موشک و صرفاً با محموله های سوختی که دارد، 2.38 کیلومتر بر ثانیه سرعت بگیرد و بعد از فرار از جاذبه ماه، 1.34 کیلومتر با ثانیه سرعت خود را کم کند. حالا شما تصور کنید، علاوه بر این محموله های سوخت، مخازن اکسیژن برای حداقل 6 روز و 7 ساعت، بعضی امکانات اولیه هم لازمه.
حالا بر گردیم به دهه 60:
October 4, 1957 - Sputnik 1, the first man-made object to orbit the Earth, is launched by the U.S.S.R., and remains in orbit until January 4, 1958.
November 3, 1957 - Sputnik 2, carrying the dog Laika for 7 days in orbit, is launched by the U.S.S.R., and remains in orbit until April 13, 1958.
February 3, 1966 - Soviet Luna 9 is the first spacecraft to soft-land on the moon.
March 1, 1966 - Soviet Venera 3 impacts on Venus, the first spacecraft to reach another planet. It fails to return data.
March, 1966 - Soviet Luna 10 is the first spacecraft to orbit the moon.
June 2, 1966 - Surveyor 1 is the first U.S. spacecraft to soft-land on the Moon.
August 14, 1966 - U.S. Lunar Orbiter 1 enters moon orbit, and takes the first picture of the Earth from the distance of the moon.
April 23, 1967 - Soviet Soyuz 1 is launched, carrying Vladimir M. Komarov. On April 24 it crashed, killing Komarov, the first spaceflight fatality.
October 18, 1967 - Venera 4 sends a descent capsule into the Venusian atmosphere, returning data about its composition.
September 15, 1968 - Soviet Zond 5 is launched, the first spacecraft to orbit the Moon and return.
October 11, 1968 - Apollo 7 is the first manned Apollo mission with Walter M. Schirra, Jr., Donn F. Eisele, and Walter Cunningham. It orbited the earth once.
December 21, 1968 - Apollo 8 is launched with Frank Borman, James A. Lovell, Jr. and William A. Anders, the first Apollo to use the Saturn V rocket, and the first manned spacecraft to orbit the Moon, making 10 orbits on its 6-day mission.
January, 1969 - Soyuz 4 & 5 perform the first Soviet spaceship docking, transferring Cosmonauts between vehicles.
July 20, 1969 - Neil Armstrong and Edwin Aldrin, Jr. make the first manned soft landing on the Moon, and the first moonwalk, using Apollo 11.
July 31, 1969 - Mariner 6 returns high-resolution images of the Martian surface, concentrating on the equatorial region.
August 5, 1969 - Mariner 7 returns high-resolution images of the Martian surface, concentrating on the southern hemisphere.
فقط 10 سال طول کشیده که از سگ فضانورد به فرود بر روی ماه برسند. ضمن اینکه، اگر ملاحظه کنید در تمام عرصه ها، روس ها جلوتر از آمریکایی ها بوده اند. و خیلی جالبه که سال 68، آپولو 8 دور زمین 1 بار می چرخه و بر میگرده و در سال 69، بر روی ماه فرود میاد. یک مقداری سرعت تحولات زیادی سریعه.