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No concrete evidence explains why there is a moon. The best hypothesis presented is the Giant Impactor hypothesis: It suggests that around 4.45 billion years ago, while the Earth was still forming, a large object hit the... More »

www.reference.com Science Astronomy Our Moon

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... More »

www.reference.com Science Astronomy

A black moon describes either the second new moon of a calendar month, a calendar month without a new moon, a calendar month without a full moon, or the third new moon of a season that has four new moons. More »

www.reference.com Science Astronomy Our Moon
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There is evidence that the moon is seismically active, which means it can experience the moon version of an earthquake. During the 1969 and 1972 moon landings, astronauts placed seismometers on the moon in order to allow... More »

www.reference.com Science Astronomy Our Moon

The moon is in fact gradually drifting away from the earth. Each year, the moon spins almost 4 centimeters farther from the earth, which makes the earth's day just a bit longer. While this 1.48-inch movement will eventua... More »

www.reference.com Science Astronomy Our Moon

The main way the moon affects the Earth is the tides. The moon plays an important role in protecting the Earth from space rocks, such as meteorites. More subtle effects of the moon include minor effects on climate, the h... More »

www.reference.com Science Astronomy Our Moon

The moon cannot circle the Earth in a 24-hour period. It takes approximately 27 days for the moon to orbit the Earth. In a one-year period, the moon circles the Earth 13 times. More »

www.reference.com Science Astronomy Our Moon