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A moon is a natural satellite consisting of solid material that naturally orbits a planet or dwarf planet. Although the Earth has just one moon, there are other planets that have more, and some that even have none. Moons and their planets often have very symbiotic, or close relationships.


There are eight different phases or "types" of the moon: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, last quarter and waning crescent. These phases repeat themselves approximately every 29.5 days.


There are 146 official moons in the solar system. This does not include the 27 additional celestial objects orbiting planets, the five moons orbiting the dwarf planet Pluto or the tiny moons orbiting celestial bodies other than planets and the asteroids.


Most people know that the moon's gravitational influence has an effect on the tides on Earth, but some scientists also believe that the presence of the moon played an important role in making Earth habitable to begin with. The interplay between the Earth and the moon mirrors events that occurred thr


Earth's sole natural satellite, the moon, has a circumference of 6,783.5 miles around its equator. Its surface area is 14,647,439.75 square miles, which is approximately 0.07 times that of the Earth.


The scientific consensus is that the Earth's moon formed four and half billion years ago. About 100 million years after the formation of the solar system, another small planet is likely to have collided with the Earth, resulting in the formation of the Moon.


The lunar crust is made of 43 percent oxygen, 20 percent silicon, 19 percent magnesium, 10 percent iron, 3 percent calcium and 3 percent aluminum. The moon's core is thought to consist of iron, sulfur and nickel, with the largest middle layer, or mantle, composed of olivine, clinopyroxene and orthop


Neil Armstrong was the first person to walk on the moon on July 20, 1969. He was an astronaut on the Apollo 11 mission, which had the goal to land two men on the moon.


In 2006, NASA released a plan to begin traveling to the moon again by 2020, with lunar residency missions beginning in 30-day increments in 2024 and moving to six-month missions by 2025. Since then, NASA has released further projections anticipating private residential missions as early as 2020.


The moon is located an average of 238,855 miles from the Earth, according to Space.com. Because its orbit is irregular, its closest approach to the Earth is 225,700 miles while at its farthest, the moon is 252,000 miles from the Earth.