History UsefulNotes / TheMoon

9th Jan '18 1:12:08 PM ThatFanwiththeGlasses
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Compared to other moons in UsefulNotes/TheSolarSystem, Earth's moon is really huge compared with the planet it orbits, weighing in at a whopping 1/81 of Earth's mass and 1/6 of Earth's surface gravity. By comparison, even [[UsefulNotes/TheMoonsOfSaturn the largest moon of Saturn]] is only 1/4000 of {{UsefulNotes/Saturn}}'s mass. The Moon also has roughly 2/9 the mass of {{UsefulNotes/Mercury}} and is about 1.8 times more massive than all five recognized dwarf planets (Eris, Pluto, Makemake, Haumea, and Ceres), Pluto's satellite Charon (which is more massive than Ceres), and the Asteroid Belt (Ceres excluded) ''combined''. Among UsefulNotes/{{the moons of Jupiter}} and Saturn, only Ganymede, Titan, Callisto, and Io are more massive than the Moon. Of them only Io is dense enough to have a higher surface gravity than the Moon.

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Compared to other moons in UsefulNotes/TheSolarSystem, Earth's moon is really huge compared with the planet it orbits, weighing in at a whopping 1/81 of Earth's mass and 1/6 of Earth's surface gravity. By comparison, even [[UsefulNotes/TheMoonsOfSaturn the largest moon of Saturn]] is only 1/4000 of {{UsefulNotes/Saturn}}'s mass. The Moon also has roughly 2/9 the mass of {{UsefulNotes/Mercury}} and is about 1.8 times more massive than all five recognized dwarf planets (Eris, Pluto, Makemake, Haumea, and Ceres), Pluto's satellite Charon (which is more massive than Ceres), and the Asteroid Belt (Ceres excluded) ''combined''. Among UsefulNotes/{{the moons of Jupiter}} and Saturn, only Ganymede, Titan, Callisto, and Io are more massive than the Moon. Of them only Io is dense enough to have a higher surface gravity than the Moon.
Moon. The Moon is so large in comparison to the Earth that the center of gravity between the two is about two thirds of the Earth's radius out from its center, causing the Earth to noticeably wobble around it. This has led some to believe the Earth-Moon system should be considered a double planet.
27th Oct '17 10:23:55 PM DKN117
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* Although it hasn't yet played any major role, in the ''Franchise/{{Halo}}'' universe the moon is the site of the UNSC's officer candidate academy; more than one Naval character from the series, including the famous Captain Keyes, received their training there.
10th Jan '17 2:46:52 PM ScorpiusOB1
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Despite how bright the moon may appear in the night sky, its surface is very very dark. Its albedo is a dismal 7%, which means that 93% of all incident light is absorbed without being reflected back into space. For comparison, Earth's albedo is around 38%. The difference in color between the light-colored regolith and the dark-colored maria is like the difference between coal dust and ''extra-dark'' coal dust.

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Despite how bright the moon may appear in the night sky, its surface is very very dark. Its albedo is a dismal 7%, which means that 93% of all incident light is absorbed without being reflected back into space. For comparison, Earth's albedo is around 38%. The difference in color between the light-colored regolith and the dark-colored maria is like the difference between coal dust and ''extra-dark'' coal dust.
dust[[note]]However the night sky is even darker, and that contrast causes the Moon to quite stand out[[/note]].
2nd Dec '16 9:23:06 AM megarockman
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* The sixth mission of the Soviet campaign in the ''Yuri's Revenge'' expansion of ''VideoGame/RedAlert2'' has you chase the titular villain to the moon so that he can't set up shop there. The gameplay becomes somewhat different in the mission compared to normal - there is no ore to mine, for instance, and you can produce high-flying Cosmonauts (basically normally-Allied Rocketeers specific to this mission) from Soviet barracks.
14th Oct '16 3:39:01 PM LordGro
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[[caption-width-right:350:[[Recap/DoctorWhoS32E2DayOfTheMoon You should kill us all on sight!]]]]

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[[caption-width-right:350:[[Recap/DoctorWhoS32E2DayOfTheMoon You should kill us all on sight!]]]]
8th Oct '16 3:45:54 PM AnotherGuy
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The moon's surface is covered in craters, caused by comet and asteroid impacts in the ancient (and, occasionally, recent) past. Each of those craters has a name, and most are named after scientists and philosophers. For instance, the great big crater with the huge white rays coming out of it in all directions is Tycho Crater, named after [[http://en.wikipedia.org/wiki/Tycho_Brahe Tycho Brahe]]. The moon's surface is also partially covered by "Seas" (''maria'' in [[AltumVidetur Latin]]), dark areas where ancient volcanoes spilled lava all over the place. Like the craters, each Sea has a name, but unlike the craters the Sea names are derived from things that sailors might be concerned about -- the Sea of Tranquility, the Sea of Rains, the Sea of Fecundity, etc..

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The moon's surface is covered in craters, caused by comet and asteroid impacts in the ancient (and, occasionally, recent) past. Each of those craters has a name, and most are named after scientists and philosophers. For instance, the great big crater with the huge white rays coming out of it in all directions is Tycho Crater, named after [[http://en.wikipedia.org/wiki/Tycho_Brahe Tycho Brahe]]. The moon's surface is also partially covered by "Seas" (''maria'' in [[AltumVidetur Latin]]), dark areas where ancient volcanoes spilled lava all over the place. Like the craters, each Sea has a name, but unlike the craters the Sea names are derived from things that sailors might be concerned about -- the Sea of Tranquility, the Sea of Rains, the Sea of Fecundity, etc..
etc. Another interesting note is that the Moon ''does'' have a thin atmosphere, called an "exosphere". It's visible when there's a new moon and the Moon shows off a sulfurous "tail".
18th Sep '16 5:34:01 PM JamesAustin
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[[caption-width-right:250:[[Recap/DoctorWhoS32E2DayOfTheMoon You should kill us all on sight!]]]]

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[[caption-width-right:250:[[Recap/DoctorWhoS32E2DayOfTheMoon [[caption-width-right:350:[[Recap/DoctorWhoS32E2DayOfTheMoon You should kill us all on sight!]]]]
18th Sep '16 5:33:49 PM JamesAustin
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[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/250px-FullMoon2010_5637.jpg]]

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[[quoteright:250:http://static.[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/250px-FullMoon2010_5637.jpg]]org/pmwiki/pub/images/350px_fullmoon2010_5637.jpg]]



{{UsefulNotes/Earth}}'s only--or at least, only significant--natural satellite. While it's referred to as [[SpellMyNameWithAThe the Moon]], it's called by its Roman name, '''Luna''', when differentiating it with the other satellites in the Solar System. It has been named Selene, Cynthia, and Diane by the Roman and Greek ancients as well. Of course, this is where the word "lunar" comes from, as well as the Greek prefix seleno- (e.g selenophobia, fear of the moon.)

It orbits our planet some 400,000 kilometers away, taking 27.3 days to go all the way around once. (Since the Earth will have moved some distance around {{UsefulNotes/the sun}} by the time the moon has orbited once, it takes a little longer--29.5 days total, to be precise--for the lunar light-cycle to get back around to the same phase it started in.) Tidal forces long ago caused the moon to lock in synchronous rotation with the Earth, so that the same side is always facing us.

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{{UsefulNotes/Earth}}'s UsefulNotes/{{Earth}}'s only--or at least, only significant--natural satellite. While it's referred to as [[SpellMyNameWithAThe the Moon]], it's called by its Roman name, '''Luna''', when differentiating it with the other satellites in the Solar System. It has been named Selene, Cynthia, and Diane by the Roman and Greek ancients as well. Of course, this is where the word "lunar" comes from, as well as the Greek prefix seleno- (e.g selenophobia, fear of the moon.)

It orbits our planet some 400,000 kilometers away, taking 27.3 days to go all the way around once. (Since the Earth will have moved some distance around {{UsefulNotes/the UsefulNotes/{{the sun}} by the time the moon has orbited once, it takes a little longer--29.5 days total, to be precise--for the lunar light-cycle to get back around to the same phase it started in.) Tidal forces long ago caused the moon to lock in synchronous rotation with the Earth, so that the same side is always facing us.
19th Aug '16 6:40:58 AM AnotherGuy
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{{UsefulNotes/Earth}}'s only--or at least, only significant--natural satellite. While it's referred to as [[SpellMyNameWithAThe the Moon]], it's referred to its Roman name, '''Luna''', when differentiating it with the other satellites in the Solar System. It has been named Selene, Cynthia, and Diane by the Roman and Greek ancients as well. Of course, this is where the word "lunar" comes from, as well as the Greek prefix seleno- (e.g selenophobia, fear of the moon.)

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{{UsefulNotes/Earth}}'s only--or at least, only significant--natural satellite. While it's referred to as [[SpellMyNameWithAThe the Moon]], it's referred to called by its Roman name, '''Luna''', when differentiating it with the other satellites in the Solar System. It has been named Selene, Cynthia, and Diane by the Roman and Greek ancients as well. Of course, this is where the word "lunar" comes from, as well as the Greek prefix seleno- (e.g selenophobia, fear of the moon.)
19th Aug '16 6:39:05 AM AnotherGuy
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Currently, our best guess at how such a humongous companion came into existence is that a UsefulNotes/{{Mars}}-sized planetesimal struck the Earth early in its formation period, which knocked loose a huge chunk of material that eventually cooled, congealed, and settled into the moon's current nearly-circular orbit. However, a recent comparison of the Earth-moon titanium isotope ratio has [[http://www.huffingtonpost.com/2012/03/26/moon-formation-theory-new-study_n_1380127.html thrown this model into question]].

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Currently, our best guess at how such a humongous companion came into existence is that a UsefulNotes/{{Mars}}-sized planetesimal struck the Earth early in its formation period, which knocked loose a huge chunk of material that eventually cooled, congealed, and settled into the moon's current nearly-circular orbit. However, New discoveries confirm this theories, as scientists have found that the Moon was tidally locked only a recent comparison hundred days after the collision, "baking" one side of the Earth-moon titanium isotope ratio has [[http://www.huffingtonpost.com/2012/03/26/moon-formation-theory-new-study_n_1380127.html thrown this model into question]].
Moon, and the other side thickening from the vaporized crust, explaining the odd crust dichotomy of the satellite. Even more amazingly, the "strange lights" that have been seen in the last few decades are probable indication that the Moon's core is NotQuiteDead, such as the flashes of light from Aristarchus, one of the ancient lunar volcanoes. In reality, instead of being UFO's, it's actually heated expulsion of dust from the Moon's crust.
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