The United States would go on to complete six crewed missions to the moon that landed a total of 12 astronauts (all men) from 1969 to 1972 in a series of Apollo missions numbering up to Apollo 17.
- 99.86% of the solar system’s mass is found in the Sun. The majority of the remaining 0.14% is contained within the eight planets.
- The four smaller inner planets, also known as the “terrestrial planets”, are primarily composed of rock and metal.
- The four outer planets, also known as the “gas giants”, are substantially larger and more massive than the inner planets.
- The two innermost gas giants, Jupiter and Saturn, are the largest of the four outer planets and are composed mainly of hydrogen and helium.
- The two outermost gas giants, Uranus and Neptune, are composed largely of ices (water, ammonia and methane). Together they are referred to as the “ice giants“.
- Other structures of note in the solar system the Asteroid Belt, Kuiper Belt and Oort Cloud.
- The solar system consists of the Sun, planets, dwarf planets, moons, and numerous smaller objects such as comets and asteroids.
- 194 moons, 3,583 comets and 796,289 asteroids have been found in the solar system.