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of Rains) are over 1,000km across. They were formed during the
early history of the Moon, when meteorites struck the unprotected surface. The impact of the larger meteorites would have generated so much heat that the rock would have become molten and flooded over the land, producing areas with a smooth surface.
The Moon may have been formed when a large object struck the still-forming Earth, tearing a chunk of rock away.
Waning Gibbous Moon
Waning Crescent Moon
Crescent Moon: less than a Half Moon.
 Moon, phases—The phases of the Moon.
for the Moon to make a complete orbit and return to the same phase (i.e., have the same illumination when seen from the Earth) is a little longer—29 days, 12 hours, 44 minutes, and 2.8 seconds.
A gibbous Moon occurs when the Moon is between half and a full Moon. The crescent Moon is less than half a moon. (See also: Lunar eclipse.)
Moon, phases
Neither the Earth nor the Moon has any light of its own. But
as they orbit the Sun, they are illuminated by light from it. The way we see this illumination creates the phases of the Moon.
The Moon revolves around
the Earth in 27 days, 7 hours, 43 minutes, and 11.6 seconds. This is called a sidereal month. However, because the Earth is also moving around the Sun, the time it takes
Half Moon
Moon, phases
Gibbous Moon: more than half but less than a Full Moon. The name is from the Latin for hump, meaning humped Moon.
Waxing Gibbous Moon
Half Moon
Waxing: to get bigger Waning: to get smaller
Waxing Crescent Moon
New Moon
Full Moon
Earth
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Sunlight