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THE MOONThe Moon is one of the most popular celestial objects in the sky, graces our night sky like a patch of glowing ball.Lunar is the name of the Earth's only natural satellite called a Moon.
 She is so important to us that we have a day specially named after it. Monday (Moon day).
 
She
 is deified as a Goddess to many cultures, one of the determining clock 
hands of our time measurement and a very fascinating celestial neighbour
 she is to us. 
All of us have seen the moon, in fact we have 
spent countless nights mopping at it and imagining what actually that 
is, it has been a subject of our imaginations and lores as children.
 
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1. Formation
The events leading to the wedlock of our Dear Earth to her Moon was not a peaceful ceremony at all. 
Not even close to being peaceful. 
Early
 in the solar system's formation, the whole system was a battle field of
 hot high speeding debris, asteroids and meteors crashing into each and 
other into planets. 
The earth has gotten a very big share of 
these celestial bombardments of fire raining meteors of which we have 
craters testifying to this 
So the first billion years of the 
earth was a very violent one of which brought about earth's water 
delivered from these catastrophic bombardments of celestial bombs. 
Though
 a subject of many scientific probings the most widely accepted theory 
on Moon's formation is a head on collision between the earth and a Mars 
sized Asteroid named Theia. 
These two very hot planetary objects 
in the early stage of the system formation 4.5billion years barely 
50million years after the earth's formation collided in a very violent 
and quaking union. 
This collision released debris (remnants of the reaction) lead to the moon's formation.. 
So the moon was a child of a violent wedlock between earth and theia 
  
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2. The moon is as bright as Coal
We all see glowing ball brightly throwing down silvery rays of a shadowy beam. 
But in actuality the moon is a very very very Dark object not even brighter than a Coal. 
The
 light we get from the moon has nothing to do with the moon, the moon 
has no light at all but rather acts as a reflective plate for the 
sunlight it gets from the sun.. 
You must have noticed that during
 a crescent or half moon you can see the remaining outline of the full 
moon but it remains pitch dark, that is because that side is shielded 
from direct sunlight. 
Or during an eclipse the moon becomes a fully mean ominous dark opaque object to us. 
So without light from the sun hitting the moon, it is just one pitch black piece of coal.. 
Even
 with as much sunlight as it gets the moon has a very poor reflective 
ability that it only reflects 12% maximum of all the light it gets from 
the sun, compare this with Venus that reflects almost 75%. 
If 
Venus was as close to us as the moon, our nights would just be like 
evening because Venus is way too bright no wonder it is called the 
morning sun, when do we get to sleep if that was the case? 
The
 earth is by far brighter than the moon, the earth reflects more than 
55% of the sun light it gets.. so the earth is more than 7times brighter
 than the moon. 
So the moon is not a light and so doesn't shine it only reflects a very poor amount of sunlight it gets.
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3. The Moon Controls Our Ocean TideYeah
 where are the "Avatar the last air-bender's Fans" Come out this is for 
you... The film clearly states the moon as the first water bender. Well that is so so true because the moon is an important factor in the calibration of ocean tides.
 The moon is not the factor but just one of many. Others include the Sun, Earth's rotation 
etc..
 As you may have noticed, water is a very cohesive compound,
 water molecules always sticks together notice if you drop two pinch of 
water close together they merge into one whole.
 So the earth's 
centrifugal force caused by the rotation water molecules are being 
pulled away from the surface leading to a bulge near the equator than 
towards the pole
 If the earth simply rotated on its own axis, 
then even though there would be this bulge there would be no tide. 
However, because the moon is very close to the earth, its gravity exerts
 an effect on the rotational system of the earth, causing it to also 
rotates in tandem with the moon on a different axis.
 Because of 
this additional rotation, there is an additional centrifugal force 
exerted on the side of the earth that is away from the moon.
 Thus,
 the centrifugal force is greatest on the side of the earth that is away
 from the moon, and there is a greater bulge in the water on that side.
 That is how the moon's tidal effects manifests on the earth's ocean tides..
 
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4. The Moon is tidally locked to earth 
This should be a question that must have been bothering every curious 
mind we have here who one or two times might have looked up to gaze at 
the moon. 
"Why is that we only see one side of the moon all the time? 
Yes
 that is true, the moon is tidally locked.. This means that it takes the
 exact same amount of time for the moon to finish one orbital revolution
 and also achieve one full axial rotation therefore only one part of it 
is always faced towards the earth. 
this is also known as Gravitational locking ... 
Following
 this you can now deduct that the reason why we always have one side of 
the moon facing us is that in the 28 days circle of the moon before 
another appearance it takes just about that time for it to fully rotate 
on it's axis so when next it appears on earth we get to see the same 
side. 
Moon axial period =28 days 
earth's axial period =24 hours.. 
See the difference ....  
Due
 to this tidal lock one side of the moon remains perpetually darkened to
 us (We call this the "Dark side of the moon) and we get to only see 
just one side ...
  
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 5. Shape
Judging
 from what we see at night from the part of moon visible, one can 
conclude the moon is a perfect sphere and wouldn't be blamed. 
But the news is, The moon is not a perfect sphere not at all, the moon has a shape known as Oblate Spheroid … 
This
 is a kind of sphere where the whole body is not perfectly uniformed but
 has bulging sides leading to little bit flattened poles. 
Like a lemon  
This is caused by by rotation of an ellipse around is smallest axial points..  
Jupiter
 also has an Oblate spheroid shape but due to the fact that one bulging 
side of the moon is always visible to us we always perceive the moon's 
shape to be spherical from here... 
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6. Water On the Moon 
We know that just few months ago liquid water was announced on Mars
 but calm down there've always been water on Mars though Frozen we were 
just surprised to find liquid ones. 
So back to the moon, Yes 
there is water on the moon and many planetary bodies in this Solar 
system though the conditions on these bodies makes it unlikely for water
 to thrive in liquid state. 
Earth is the only planet were water exists in liquid form in a large scale, Mars has joined the list but just in a small scale. 
Over the years there have been speculations of Frozen water lurking in the hidden craters on the moon surface. 
Not until the most recent man made probe (LRO) to the moon started orbiting the satellite has the picture became ever clearer.
   
From
 Data curled from the Lunar Reconnaissance Orbiter, Hydrogen and Oxygen 
atoms have been detected just in the Lunar surface showing there is 
Water Molecules lurking within the Lunar soil. 
Yes it may not be flowing swimmable water type found on earth but in this regard Water is water. 
Since
 has reaffirmed the idea that within some perpetually darkened craters 
in the lunar world, there may be Frozen water on them. 
But all in
 all the LRO has satisfied our taste for that answer as it confirms that
 water molecules indeed exists on the moon too..  
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7. Gravity
Like "Everything you throw up must surely come down" that too 
works on the moon contrary to the myth that if you are on the moon you 
will be floating around because there is no gravity. 
No, there is gravitational pull on the moon only just drastically lesser than that of the earth. 
Gravity is as a result of the distortion of space/time by Mass, so the greater the mass the greater the distortion (Gravity).
   
Will
 like us all to take a little experiment to show how gravity works. Take
 a sheet of clothing or net and spread (suspend in mid air) it across on
 all four angles (this represents space/time) then bring a heavy object 
and place it on the fabrics. 
You will notice the fabric dents 
with the weight of the object then bring an object of lesser weight and 
put within the boundary of the dent you will notice that it will slide 
down towards the center of the dent.. That is gravity.. 
So back 
to the Moon's gravity, the Mass of earth is greater than that of the 
moon so the distortion of space/time by earth is far more greater. 
That is why we witness a gravitational pull of about 9.8m/s approximately 10m/s while on the moon is roughly 1.6m/s. 
So notice the deference..  
N.B:
 The moon has no atmosphere so is almost like a Vacuum, this means there
 is no air resistance on object thrown upwards.. A kite thrown up would 
glide with the air on earth but on the moon it would fall back down..
 
This photo wasn't taken from the moon but a NIKE commercial called the moon jump
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8. SizeThere
 are officially 181 natural satellites orbitting planets and 
mini-planets in this solar system (A planet like jupiter and Saturn has 
up to 67 and 64 moons respectively) Greedy bastardsFew
 of these Moons are massive enough to achieve hydrostatic equilibrium so
 if they orbited the sun directly and not planets they would have been 
dubbed planets or mini-planets.
 With Ganymede topping the list of the largest moon in the solar system, this moon of jupiter is larger than Mercury and Pluto.
 Our
 moon comes 5th in the list of largest satellites in the solar system 
but comes 2nd when the size of the moon is compared with the size of 
it's host planet with almost 1/4 of the earth's size.
 with a 
surface of 37.9 million square kilometers its actually slightly smaller 
than the continent Asia which is 44million square kilometers..
 
 
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9. The Moon is drifting Away
Yes thats a sad one but very very slowly we are loosing the moon as it drifts further away from us. 
The
 Apollo missions saw the installment of Reflectors on the moon's surface
 and from here we shoot laser beams to the reflectors to determine the 
distance between us and our moon and datas provided shows it is moving 
away from us though at a very minute rate of 3.8Cm per year. 
So 
billions of years ago in the early history of the earth the moon would 
have been so close to the earth that it appears so in the sky.
   
with
 time the moon will continue drifting slowly further away from the earth
 until the gravitational attraction from the sun on it becomes greater 
than that of the earth on it and then earth will become a moonless 
planet just like mecury and venus are moonless. 
The presence of the moon in the earth's tidal system is slowing the planet down gradually by 2milisecond per century. 
So
 the earth's axial period is getting longer every century by 
2milisecond, going backward into the earth's history there would be a 
time the planet is spinning so fast that a day would rarely last 
18hours. 
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10. Visitation
Many
 planetary bodies in the solar system has man made probes orbiting them 
and taking readings sending back to us a wealth of data for study. 
Mars
 and the Moon are the only of these bodies that has man made probing 
rovers inside on their surface while the moon holds the record for the 
only celestial body to have ever seen another human. 
Out of all 
the planets, moons, asteroids and dwarf-planets man has only being able 
to to make a trip to the moon which is just a three days ride with the 
amount of technology at our disposal.  
There have been 6 manned missions to the moon (The Apollo missions) and another manned mission due for 2023. 
This time it won't be for few hours but long days of study on the surface of the moon by astronauts. 
Its
 no doubt that the future may see a wild range of space exploration 
starting from our solar system, manned missions to Mars by 2030's the 
moon is the closest of this frontier and so hopefully will get more 
visit than any of the planetary bodies around.
 
The Apollo 
missions showed us there is no limit to what man can achieve as man has 
left an enduring footprint on the surface of the moon as a mark of his 
tremendous achievement.
   
Hopefully
 Mars gets to feel the mark of a live human on it's surface soon enough 
and in no distant future technologies that can take us beyond our solar 
system to explore planets in other star systems will be available.
 
With
 all the knowledge we gain from our study of the heavens, it should 
humble us and give us a sense of belonging and give us the insight to 
look at our own earth as a jewel that deserves to be preserved because 
mankind must put an end to senseless exploitation and violence or we 
will end up killing the earth and killing the earth is our own end.
 
Look to the stars and heavens but cherish the earth...  
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