Moon

lunarthe moonLunaEarth's moonlunar surfacemoon's origin and evolutionMoons1languagephases of the moon
The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.wikipedia
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Earth

terrestrialworldGlobal
The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.
Earth's gravity interacts with other objects in space, especially the Sun and the Moon, Earth's only natural satellite.

Mars

Martianplanet MarsRed Planet
The most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a Mars-sized body called Theia.
Mars is a terrestrial planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the valleys, deserts, and polar ice caps of Earth.

Age of the Earth

formation of the EarthEarthage of Earth
The Moon is thought to have formed about 4.51 billion years ago, not long after Earth.
This dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

Apollo program

ApolloApollo missionsApollo space program
The United States' NASA Apollo program achieved the only manned lunar missions to date, beginning with the first manned orbital mission by Apollo 8 in 1968, and six manned landings between 1969 and 1972, with the first being Apollo 11.
The Apollo program, also known as Project Apollo, was the third United States human spaceflight program carried out by the National Aeronautics and Space Administration (NASA), which accomplished landing the first humans on the Moon from 1969 to 1972.

Apollo 11

1969 moon landingmoon landingfirst moon landing
The United States' NASA Apollo program achieved the only manned lunar missions to date, beginning with the first manned orbital mission by Apollo 8 in 1968, and six manned landings between 1969 and 1972, with the first being Apollo 11.
Apollo 11 was the spaceflight that landed the first two people on the Moon.

Moon rock

lunar rocklunar samplelunar samples
These missions returned lunar rocks which have been used to develop a geological understanding of the Moon's origin, internal structure, and the Moon's later history.
Moon rock or lunar rock is rock that is found on the Earth's moon including lunar material collected during the course of human exploration of the Moon, or rock that has been ejected naturally from the Moon's surface (and which has then landed on the Earth as meteorites).

Moon in fiction

MoonSomniumthe moon
Such cultural influences can be found in language, lunar calendar systems, art, and mythology.
The Moon has been the subject of many works of art and literature and the inspiration for countless others.

Tidal acceleration

tidal frictiontidal decelerationtidal heating
Its gravitational influence produces the ocean tides, body tides, and the slight lengthening of the day.
Tidal acceleration is an effect of the tidal forces between an orbiting natural satellite (e.g. the Moon), and the primary planet that it orbits (e.g. Earth).

Jupiter

Jovianplanet JupiterGiove
The Moon is after Jupiter's satellite Io the second-densest satellite in the Solar System among those whose densities are known.
When viewed from Earth, Jupiter can reach an apparent magnitude of −2.94, bright enough for its reflected light to cast shadows, and making it on average the third-brightest natural object in the night sky after the Moon and Venus.

Geology of the Moon

lunar surfacelunar highlandshighlands
These missions returned lunar rocks which have been used to develop a geological understanding of the Moon's origin, internal structure, and the Moon's later history.
The Moon lacks a significant atmosphere, which eliminates erosion due to weather; it does not have any form of plate tectonics, it has a lower gravity, and because of its small size, it cooled more rapidly.

Apollo 8

8Debrief: Apollo 8Apollo 8 mission
The United States' NASA Apollo program achieved the only manned lunar missions to date, beginning with the first manned orbital mission by Apollo 8 in 1968, and six manned landings between 1969 and 1972, with the first being Apollo 11.
Apollo 8, the second manned spaceflight mission in the United States Apollo space program, was launched on December 21, 1968, and became the first manned spacecraft to leave low Earth orbit, reach the Earth's Moon, orbit it and return safely to Earth.

Impact crater

cratercratersimpact basin
The near side is marked by dark volcanic maria that fill the spaces between the bright ancient crustal highlands and the prominent impact craters.
Impact craters are the dominant geographic features on many solid Solar System objects including the Moon, Mercury, Callisto, Ganymede and most small moons and asteroids.

Selenography

selenographerlunar scienceselenographic
It is derived from the Ancient Greek word for the Moon, σελήνη (selḗnē), from which is however also derived the prefix "seleno-", as in selenography, the study of the physical features of the Moon, as well as the element name selenium.
Selenography is the study of the surface and physical features of the Moon.

Diana (mythology)

DianaTriviaDiane
Both the Greek goddess Selene and the Roman goddess Diana were alternatively called Cynthia.
Diana (Classical Latin: ) is a Roman goddess of the hunt, the moon, and nature, associated with wild animals and woodland.

Natural satellite

moonmoonssatellite
The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.
The first known natural satellite was the Moon, but it was considered a "planet" until Copernicus' introduction of De revolutionibus orbium coelestium in 1543.

Lunar distance (astronomy)

lunar distancesLDlunar distance
The Moon's average orbital distance is, or 1.28 light-seconds.
It is the average distance from the center of Earth to the center of the Moon.

Selene

LunaSelenitesSelenite
Both the Greek goddess Selene and the Roman goddess Diana were alternatively called Cynthia.
In Greek mythology, Selene ( "Moon") is the goddess of the moon.

Luna 2

Lunikthe Russians did that in 1959first man-made object hitting the Moon's surface
The Moon was first reached in September 1959 by the Soviet Union's Luna 2, an unmanned spacecraft.
Luna 2 (E-1A series) or Lunik 2 was the second of the Soviet Union's Luna programme spacecraft launched to the Moon.

List of Solar System objects by size

largestthe fifth-largestsmaller
It is the fifth-largest natural satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits (its primary).

Giant-impact hypothesis

giant impact hypothesisgiant impactgiant impacts
The most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a Mars-sized body called Theia.
The giant-impact hypothesis, sometimes called the Big Splash, or the Theia Impact suggests that the Moon formed out of the debris left over from a collision between Earth and an astronomical body the size of Mars, approximately 4.5 billion years ago, in the Hadean eon; about 20 to 100 million years after the solar system coalesced.

Lunar calendar

lunarlunar yearlunar month
Such cultural influences can be found in language, lunar calendar systems, art, and mythology.
A lunar calendar is a calendar based upon the monthly cycles of the Moon's phases (synodic months), in contrast to solar calendars, whose annual cycles are based only directly upon the solar year.

Lunar mare

marelunar mariamaria
The near side is marked by dark volcanic maria that fill the spaces between the bright ancient crustal highlands and the prominent impact craters.
The lunar maria (singular: mare ) are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions.

Night sky

night skiessky''' of the Earthsky of Earth
Its surface is actually dark, although compared to the night sky it appears very bright, with a reflectance just slightly higher than that of worn asphalt.
The term night sky, usually associated with astronomy from Earth, refers to the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon.

Origin of the Moon

moon was createdMoon's originMoon was once a part of the Earth
These missions returned lunar rocks which have been used to develop a geological understanding of the Moon's origin, internal structure, and the Moon's later history.
The origin of the Moon is usually explained by a Mars-sized body striking the Earth, making a debris ring that eventually collected into a single natural satellite, the Moon, but there are a number of variations on this giant-impact hypothesis, as well as alternate explanations, and research into how the Moon came to be continues.

Near side of the Moon

near sidelunar near sideside visible from Earth
The Moon is in synchronous rotation with Earth, and thus always shows the same side to Earth, the near side.
Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as synchronous rotation, or tidal locking.