Difference between revisions of "Luna"

From Lunarpedia
Jump to: navigation, search
Line 1: Line 1:
 
{{License-Public Domain}}
 
{{License-Public Domain}}
 
[[Image:MoonSml.jpg]]<BR><BR>
 
[[Image:MoonSml.jpg]]<BR><BR>
In general terms, a moon is any natural satellite of a planet.  ''The'' Moon usually refers to the Earth's primary natural satellite, sometimes called [[Luna]].   
+
In general terms, a moon is any natural satellite of a planet.  ''The'' Moon usually refers to the Earth's primary natural satellite, sometimes called [[Luna]].  The moon is of interest to space colonization advocates primarily because of the shallowness of its gravity well, its lack of atmosphere, the comparatively easy access to its natural resources, and its close proximity to Earth.   
  
 +
<BR>
 +
==Physical Properties==
 +
 +
The moon has an orbital radius of about 384,000 kilometers, and an orbital period of approximately 28 days.  The moon is in a state of [[tidal lock]], meaning the it's rotation period is exactly the same as it's orbital period, with the result that one hemisphere of the moon always faces the earth.  On most parts of the moon, the lunar day is 14 Earth days long and lunar night is similarly 14 Earth days long.  Since the moon is essentially airless, daytime and nighttime temperatures can be quite extreme, with daytime temperatures higher than 400 degrees Kelvin (250 degrees Fahrenheit) and nighttime temperatures lower than 100 degrees Kelvin (-250 degrees Fahrenheit).
 +
 +
<BR>
 +
==Natural History==
 +
 +
The moon formed approximately 4 billion years ago.  The generally accepted theory of lunar formation, proposed by William K Hartmann and Donald R Davis, is that the moon was formed as a result of a large impact between the Earth and a Mars-sized object.  The resultant ejecta formed an orbiting ring of debris around the Earth which eventually coalesced into the now familiar moon.
 +
 +
<BR>
 +
==Exploration History==
 +
 +
<BR>
 +
==Resources==
 +
 +
<BR>
 
==Links==
 
==Links==
  
[http://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html Lunar Factsheet]
+
[http://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html Lunar Factsheet]<BR>
 +
[http://www.psi.edu/projects/moon/moon.html Lunar Formation Theory]

Revision as of 14:44, 18 October 2006

Public Domain
This article and all articles and their revisions in the main namespace are released to the Public Domain and can be used when attribution or sharing of changes are not feasible. Articles in in other namespaces, such as GFDL and CC Lunar are NOT released to the Public Domain.

MoonSml.jpg

In general terms, a moon is any natural satellite of a planet. The Moon usually refers to the Earth's primary natural satellite, sometimes called Luna. The moon is of interest to space colonization advocates primarily because of the shallowness of its gravity well, its lack of atmosphere, the comparatively easy access to its natural resources, and its close proximity to Earth.


Physical Properties

The moon has an orbital radius of about 384,000 kilometers, and an orbital period of approximately 28 days. The moon is in a state of tidal lock, meaning the it's rotation period is exactly the same as it's orbital period, with the result that one hemisphere of the moon always faces the earth. On most parts of the moon, the lunar day is 14 Earth days long and lunar night is similarly 14 Earth days long. Since the moon is essentially airless, daytime and nighttime temperatures can be quite extreme, with daytime temperatures higher than 400 degrees Kelvin (250 degrees Fahrenheit) and nighttime temperatures lower than 100 degrees Kelvin (-250 degrees Fahrenheit).


Natural History

The moon formed approximately 4 billion years ago. The generally accepted theory of lunar formation, proposed by William K Hartmann and Donald R Davis, is that the moon was formed as a result of a large impact between the Earth and a Mars-sized object. The resultant ejecta formed an orbiting ring of debris around the Earth which eventually coalesced into the now familiar moon.


Exploration History


Resources


Links

Lunar Factsheet
Lunar Formation Theory