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Bookmark or Share- Moon Phases - NASA ScienceSometimes the Moon seems to disappear. These shifts are called moon phases. The eight lunar phases are, in order: new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and waning crescent. The cycle repeats once a month (every 29.5 days).
- In Depth | Earth's Moon – NASA Solar System ExplorationThe brightest and largest object in our night sky, the Moon makes Earth a more livable planet by moderating our home planet's wobble on its axis, leading to a relatively stable climate. It also causes tides, creating a rhythm that has guided humans for thousands of years.
- Earth's Moon - Science@NASAThe Moon makes Earth more livable, sets the rhythm of ocean tides, and keeps a record of our solar system's history.
- Moon - WikipediaIn geophysical terms, the Moon is a planetary-mass object or satellite planet. Its mass is 1.2% that of the Earth, and its diameter is 3,474 km (2,159 mi), roughly one-quarter of Earth's (about as wide as the United States from coast to coast).
- Moon | Glenn Research Center | NASAThe Moon completes an orbit of the Earth every 27.3 days (approximately 655 hours). The Moon also rotates on its axis. Because of tidal forces, it completes one revolution every 655 hours.
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