Adjective(s) Lunarian
Orbital properties
Aphelion/apoapsis 405400 km

(404000–406700 km)

Perihelion/periapsis 362600 km

(356400–370400 km)

Semi-major axis 384399 km (0.00257 AU)
Orbital eccentricity 0.0549
Orbital period 27.321582 d

(27 d 7 h 43.1 min)

Average orbital speed 1.022 km/s
Physical properties
Radius 1737.10 km
(0.273 Earths)
Mass 7.3477×1022 kg
(0.012300 Earths)
Mean density 3.3464 g/cm3

0.606 × Earth

Escape velocity 4.627 m/s
Rotation period 27.321582 d (synchronous)
Average surface temperature min mean max

100 K 220 K 390 K
70 K 130 K 230 K

Apparent magnitude −2.5 to −12.9

−12.74 (mean full moon)

Moons Several artifical satellites

The Moon, also known as Luna is the Earth's only natural satellite. It is the only body in space that humans have been to.


The Moon may have formed when a small planet that shared Earth's orbit collided with the Earth and blew rocks up into space. The rocks could have stuck together to form the Moon.


  • The first space probe to reach the moon was Luna 2.
  • The first manned mission to the Moon was Apollo 11 on July 20, 1969.
  • The first person to walk on the moon was Neil Armstrong.
  • The last manned mission to the Moon was Apollo 17.

Life on Earth's MoonEdit

Although life doesn't naturally exist on the moon, bacteria has ended up on the moon on spacecrafts during explorations, and survived, thus meaning life exists off of Earth, even if the life isn't Alien to Earth.

The moon may have aliens hiding on it.

Importance to EarthEdit

In theory, life on Earth wouldn't be possible without the moon. This is because without the moon, the Earth would theoretically wobble on it's axis, causing extreme changes in temperature.

Faces of the MoonEdit

Phases of the moon

From left to right: Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Third Quarter, Waning Crescent. New Moon not shown.

As the moon orbits around the Earth, the amount of sunlight reflected off the moon to the Earth changes. Each face occurs approximately once per month.


There are 2 kinds of tides caused by the moon, spring tides, and neap tides. Both tides occur twice per month.

Spring tides are when there is an extreme distance between high tide, and low tide.Spring tides occur when the moon is in line with the sun, on either side of the Earth, or the full moon, and new moon.

Neap tides are when there is a small difference between high tide, and low tide.Neap tides occur between spring tides, during the first quarter, and third quarter.


  • The Moon takes about one month to complete its orbit around Earth.
  • Rocks found on the moon are similar to those on Earth.
  • The Moon is the fifth largest moon.
  • It is called more by the name "moon" than other names for it.
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