telling about the moon.

samiun (53)in #story • 8 years ago

The moon is Earth's only natural satellite, and is the 5th largest natural satellite in the Solar System. The moon does not have its own light source and the light of the Moon actually comes from the reflection of the sun.The average distance of Earth-Moon from center to center is 384.403 km, about 30 times the diameter of Earth. The diameter of the Moon is 3,474 km, slightly smaller than a quarter of the Earth's diameter. This means that the volume of the Moon is only about 2 percent of Earth's volume and the gravitational pull on its surface is about 17 percent less than the Earth's gravitational pull. The moon circulates around the Earth once every 27.3 days (perode orbit), and the periodic variation in the Earth-Moon-Sun system is responsible for the occurrence of repeating Moon phases every 29.5 days (synodic perode).

The Moon type mass (3.4 g / cm³) is lighter than the Earth's mass (5.5 g / cm³), whereas the Moon mass is only 0.012 Earth masses.
The moon drawn by the Earth's gravitational force does not fall to Earth caused by the centrifugal force arising from the orbit of the Moon around the earth. The magnitude of the centrifugal force of the Moon is slightly larger than the attractive force between Earth and Moon grafvitasi. This causes the Moon to further away from Earth at about 3.8cm / year.

The moon is in a synchronous orbit with the Earth, causing only one side of the Moon's surface to be observed from Earth. Synchronous orbits cause rotation times equal to the time of its revolution.
In the moon there is no air or water. Many craters are produced on the surface of the moon caused by a comet or asteroid blast. The absence of air and water on the moon led to the absence of erosion that caused many craters on the moon that were millions of years old and still intact. Among the largest craters is Clavvius with a diameter of 230 kilometers and as deep as 3.6 kilometers. The absence of air also causes no sound to be heard on the Moon.

The moon today is the only celestial body ever visited and landed by humans.
The first artificial object to pass near the Moon is the Soviet-owned space vehicle Luna 1, the first artificial object to hit the Moon's surface is Luna 2, and the first photo of a remote side of the moon never seen from Earth, taken by Luna 3, all missions performed in 1959.

The first spacecraft to make landfall is Luna 9, and the orbiting Moon is Luna 10, both done in 1966.
The Apollo program, the United States space mission program, is the only manned mission that has so far made six manned landings between 1969 and 1972.