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THE MOON
The 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 Tide
Yeah
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. Size
There
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 bastards
Few
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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| God is indeed wonderful |
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