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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

Moon phases occur because the angle of the Earth, moon and sun changes as the moon orbits the Earth. One-half of the moon is always illuminated by the sun. As a person's angle of sight changes, different portions of sunl... 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

Moon phases occur because the angle of the Earth, moon and sun changes as the moon orbits the Earth. One-half of the moon is always illuminated by the sun. As a person's angle of sight changes, different portions of sunl... More »

www.reference.com Science Astronomy Our Moon

The moon appears to change size depending on its location in the sky because of the phenomenon called the moon illusion. The apparent change in size occurs because of how the viewer's brain interprets the visual data it ... More »

www.reference.com Science Astronomy Our Moon

The moon moves across the sky every night. The movement of the moon can be seen over the course of minutes when the moon is near the horizon, while it is rising and setting. The moon’s movement is also noticeable around ... More »

www.reference.com Science Astronomy Our Moon