A Basic Earth/Moon Comparison



Relative Earth and Moon Sizes to Scale
(Distance between them is not to scale.)

         THE MOON (LUNA) - SOME BASIC PHYSICAL DATA - NASA/JPL

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LUNAR RADIUS

Polar      = 1736.0 km = 1078.7 mi
Mean       = 1737.1 km = 1079.4 mi
Equatorial = 1738.1 km = 1080.0 mi

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GEOCENTRIC DISTANCE

Min  = 363301 km = 225745 mi = perigee
Mean = 384401 km = 238856 mi
Max  = 405502 km = 251967 mi = apogee

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MEAN LUNAR SURFACE TEMPERATURES

During the Day   =  107 C  =  +227 F  =  380 K
During the Night = -153 C  =  -243 F  =  216 K

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SURFACE GRAVITATIONAL ACCELERATION

1.63 m/s² = 5.37 ft/s²

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MOON/EARTH SURFACE GRAVITY RATIO

1.63 / 9.81 = 0.166
This means that on the moon, any person or object would have only
about 1/6 as much gravitational weight as experienced on Earth.

The Earth is only about 4 times 'larger' than the moon, but it
contains some 81.3 times more material mass and about 6 times
the gravity at the surface.

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LUNAR ESCAPE VELOCITY

2.38 km/s = 1.48 mi/s = 8570 km/h = 5330 mi/h

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ATMOSPHERE

There is no air mostly due to the low gravity being insufficient to
retain an atmosphere in such close proximity to the sun and no means
of sufficient replenishment even if it did at one time.

Gravity and temperature are very important factors involved in the
long-term retention of an atmosphere.

Jay Tanner - 2014