50 Fun Facts About The Moon

How long does it take the Moon to orbit the Earth once?

The Moon takes approximately 27.3 days to complete one orbit around the Earth, a period known as the sidereal month.

What is the name of the first human to walk on the Moon?

Neil Armstrong became the first human to walk on the Moon on July 20, 1969, during the Apollo 11 mission.

What causes the phases of the Moon?

Lunar phases are caused by the changing geometric relationship between the Sun, Earth, and Moon. As the Moon orbits Earth, different portions of its sunlit surface are visible from our perspective.

What is the approximate distance from the Earth to the Moon?

The average distance from Earth to the Moon is approximately 238,900 miles (384,400 km). This distance varies slightly because the Moon's orbit is elliptical.

What is the Moon's largest dark plain called?

Oceanus Procellarum (Ocean of Storms) is the largest dark plain (mare) on the Moon, covering roughly 2,500 km across the western face of the near side.

Which Apollo mission was the first to land humans on the Moon?

Apollo 11 was the first mission to land humans on the Moon on July 20, 1969. Apollo 8 orbited the Moon but did not land, and Apollo 10 was a dress rehearsal.

What is the term for the Moon's near side always facing Earth?

Tidal locking (or synchronous rotation) means the Moon's rotation period matches its orbital period, so the same hemisphere always faces Earth.

What name is given to a month's second full Moon?

A Blue Moon is the colloquial term for the second full Moon occurring within a single calendar month. Despite the name, it does not appear blue.

Which theory is most widely accepted for the Moon's formation?

The giant impact hypothesis proposes that a Mars-sized body called Theia collided with the early Earth about 4.5 billion years ago, and the debris from this impact coalesced to form the Moon.

The Moon's gravity is approximately what fraction of Earth's gravity?

The Moon's surface gravity is about 1/6 of Earth's (1.62 m/s² compared to 9.81 m/s²), which is why astronauts could bounce so easily on the lunar surface.

What is the name of the first spacecraft to land on the far side of the Moon?

China's Chang'e 4 made the first-ever soft landing on the far side of the Moon on January 3, 2019, in the Von Kármán crater.

How many people have walked on the Moon in total?

Twelve people have walked on the Moon, all American men, across six Apollo missions (Apollo 11, 12, 14, 15, 16, and 17) between 1969 and 1972.

What is a lunar eclipse?

A lunar eclipse occurs when Earth passes between the Sun and the Moon, casting Earth's shadow onto the lunar surface. This can only happen during a full Moon.

What is the name of NASA's program to return humans to the Moon in the 2020s?

The Artemis program is NASA's initiative to return humans to the Moon. Named after the twin sister of Apollo in Greek mythology, it aims to land the first woman and next man on the Moon.

What did Buzz Aldrin describe the lunar landscape as when he stepped onto the Moon?

Upon stepping onto the Moon's surface during Apollo 11, Buzz Aldrin famously described it as 'magnificent desolation,' capturing both the awe and the stark emptiness of the lunar landscape.

What is the Moon's diameter approximately?

The Moon's diameter is approximately 2,159 miles (3,474 km), making it about one-quarter the diameter of Earth.

Which Apollo astronaut stayed in lunar orbit while his crewmates walked on the Moon during Apollo 11?

Michael Collins orbited the Moon alone in the Command Module Columbia while Neil Armstrong and Buzz Aldrin walked on the surface. He is sometimes called 'the loneliest man in history.'

What are the dark flat areas on the Moon's surface called?

The dark areas visible on the Moon are called maria (singular: mare), Latin for 'seas.' Early astronomers thought they were bodies of water. They are actually ancient basaltic lava plains.

What was the last Apollo mission to land on the Moon?

Apollo 17, launched in December 1972, was the last crewed mission to the Moon. Astronauts Eugene Cernan and Harrison Schmitt spent about 75 hours on the lunar surface.

What phenomenon occurs when the Moon is closest to Earth in its orbit?

Perigee is the point in the Moon's orbit where it is closest to Earth (about 226,000 miles). When a full Moon coincides with perigee, it is popularly called a 'supermoon.'

What is the name of the mare where Apollo 11 landed?

Apollo 11 landed in Mare Tranquillitatis (the Sea of Tranquility) on July 20, 1969. The specific landing site is now known as Tranquility Base.

The Moon has no atmosphere. What does this mean for sound on the Moon?

Without an atmosphere, there is no medium for sound waves to travel through on the Moon's surface. Astronauts communicated via radio because sound cannot propagate in a vacuum.

What is the largest crater on the Moon?

The South Pole-Aitken Basin is the largest known impact crater on the Moon, stretching about 1,550 miles (2,500 km) in diameter and roughly 5 miles deep. It is one of the largest impact structures in the Solar System.

Which country was the first to land a spacecraft on the Moon?

The Soviet Union's Luna 9 became the first spacecraft to achieve a soft landing on the Moon on February 3, 1966, three years before the first crewed landing.

What is moonquake?

Moonquakes are seismic events that occur on the Moon. Apollo astronauts placed seismometers that detected thousands of moonquakes. Some are caused by tidal stresses from Earth's gravity, meteorite impacts, or thermal expansion.

In Roman mythology, who was the goddess of the Moon?

Luna was the Roman goddess who personified the Moon. She was often depicted driving a white chariot across the sky. Diana was associated with the Moon but was primarily the goddess of the hunt.

What is the Moon's surface temperature during the lunar day (in direct sunlight)?

The Moon's surface temperature in direct sunlight can reach approximately 250°F (127°C). Without an atmosphere to distribute heat, the temperature drops to about -280°F (-173°C) during the lunar night.

Who was the last person to walk on the Moon?

Eugene Cernan was the last person to walk on the Moon during the Apollo 17 mission in December 1972. He re-entered the Lunar Module after Harrison Schmitt, making him the last to leave the surface.

What causes tides on Earth?

Tides are primarily caused by the gravitational pull of the Moon (and to a lesser extent the Sun) on Earth's oceans. The Moon's gravity creates a bulge of water on the side of Earth facing the Moon and another on the opposite side.

What is regolith?

Regolith is the layer of loose, fragmented material (dust, soil, and broken rock) covering the Moon's bedrock. It ranges from about 2 meters deep on maria to 20 meters on highland areas, created by billions of years of meteorite impacts.

What element is the Moon's crust primarily composed of?

Oxygen is the most abundant element in the Moon's crust by mass (about 43%), mostly bound in silicate minerals. Silicon and aluminum are the next most abundant elements.

What was the name of the Apollo 11 Lunar Module?

The Apollo 11 Lunar Module was named Eagle. Neil Armstrong's famous transmission 'The Eagle has landed' announced the successful Moon landing on July 20, 1969.

Which Indian spacecraft successfully landed near the Moon's south pole in August 2023?

Chandrayaan-3 successfully soft-landed near the Moon's south pole on August 23, 2023, making India the fourth country to land on the Moon and the first to land near the south polar region.

How long is one complete lunar day (sunrise to sunrise)?

A full lunar day (synodic period) lasts about 29.5 Earth days. This means any given spot on the Moon experiences roughly 14.75 days of continuous sunlight followed by 14.75 days of darkness.

What is the name of the Mars-sized body theorized to have collided with early Earth to form the Moon?

Theia is the hypothetical ancient planet that collided with the proto-Earth about 4.5 billion years ago. Named after the Greek Titan who was the mother of Selene (the Moon goddess), the debris from this giant impact is thought to have formed the Moon.

What did Apollo astronauts leave on the Moon to measure its distance from Earth using lasers?

Apollo astronauts left retroreflector arrays on the Moon's surface. Scientists on Earth bounce laser beams off these mirrors to measure the Earth-Moon distance with centimeter precision. The Moon moves about 3.8 cm farther from Earth each year.

Which Apollo mission famously had to abort its Moon landing due to an oxygen tank explosion?

Apollo 13 suffered an oxygen tank explosion on April 13, 1970. The crew (Jim Lovell, Jack Swigert, and Fred Haise) used the Lunar Module as a lifeboat and safely returned to Earth in what NASA called a 'successful failure.'

What is the term for when the Moon passes directly between the Earth and the Sun?

A solar eclipse occurs when the Moon passes between the Earth and the Sun, blocking sunlight. The Moon's shadow falls on Earth, and viewers within that shadow see the Sun partially or totally blocked.

What is the name of the permanently shadowed craters at the Moon's poles that may contain water ice?

Cold traps are permanently shadowed regions, mostly in craters near the Moon's poles, where temperatures can drop below -400°F (-240°C). NASA missions have confirmed the presence of water ice in these regions.

Approximately how old is the Moon?

The Moon is approximately 4.5 billion years old, roughly the same age as Earth. This age has been determined through radiometric dating of lunar rock samples brought back by Apollo missions.

Which Apollo mission first used the Lunar Roving Vehicle (moon buggy)?

Apollo 15 (July 1971) was the first mission to use the Lunar Roving Vehicle (LRV). The electric-powered buggy allowed astronauts David Scott and James Irwin to travel farther from the Lunar Module and collect more samples.

What is the Moon slowly doing to its orbit around Earth each year?

The Moon is receding from Earth at a rate of approximately 3.8 centimeters per year due to tidal interactions. This has been precisely measured using the retroreflectors left by Apollo astronauts.

In Greek mythology, who was the goddess of the Moon?

Selene was the Greek goddess who personified the Moon. She was depicted driving a silver chariot across the night sky. Artemis was later associated with the Moon, but Selene was the original Moon deity.

What is a 'Harvest Moon'?

The Harvest Moon is the full Moon that occurs closest to the autumnal equinox (around September 22-23 in the Northern Hemisphere). It rises shortly after sunset for several evenings, traditionally providing extra light for farmers harvesting crops.

What type of rock makes up most of the Moon's highland regions?

Anorthosite, a light-colored ignite rock rich in the mineral plagioclase, makes up the majority of the Moon's highland crust. It formed from the crystallization of the ancient lunar magma ocean.

What is the Artemis Gateway?

The Gateway (formally the Lunar Gateway) is a planned small space station that will orbit the Moon as part of NASA's Artemis program. It will serve as a staging point for lunar surface missions and deep-space exploration.

What is the phenomenon called when a total lunar eclipse turns the Moon reddish?

A Blood Moon occurs during a total lunar eclipse when Earth's atmosphere filters and refracts sunlight, bending red wavelengths onto the Moon's surface. The same effect that makes sunsets red gives the eclipsed Moon its coppery-red appearance.

Which astronaut hit golf balls on the Moon?

Alan Shepard hit two golf balls during the Apollo 14 mission in February 1971. Using a makeshift 6-iron attached to a soil sampling tool, he claimed the second ball went 'miles and miles' — though estimates put it at about 200 yards.

What percentage of the Moon's surface is visible from Earth over time?

While the Moon is tidally locked, a phenomenon called libration allows us to see about 59% of its surface over time. Libration occurs because the Moon's orbit is slightly elliptical and tilted, causing it to appear to wobble.

What is the name of the mineral discovered in Moon rock samples brought back by Apollo 11?

Armalcolite is a titanium-rich mineral first discovered in Moon samples from Apollo 11. It was named after the three Apollo 11 astronauts: Armstrong, Aldrin, and Collins (Arm-al-col-ite). It has since been found on Earth as well.