To the question Why is the Moon round? given by the author Country road the best answer is Celestial bodies are round because they are formed due to gravitational forces. Roughly speaking, every particle of a celestial body tries to be closer to the center. Therefore it turns out to be a ball. Cosmology considers two hypotheses: A) condensation from ownerless matter (interstellar hydrogen), exactly the same as planets, stars, etc.; B) under the influence of a gravitational carousel, a “droplet” came off from the still liquid Earth, turning into a natural satellite. The moon is always the same - round. But to us from Earth it seems that it is either half a ball or just a narrow crescent - the Moon. That is, the Moon is more than half, but less than a full sphere. We say that the Moon is waxing or waning. On a new moon we don’t see it at all, but on a full moon it is absolutely round. Why is that? It's all about the position of the Moon around the Earth and relative to the Sun, this is called the phases of the Moon for short. During the new moon, the Moon is between the Earth and the Sun, on the same line with them. During the full moon, it is also on the same line with them, but at the same time the Moon is behind the Earth
Answer from I-beam[guru]
because that’s how it was originally formed
Answer from Vasily Mitrofanov[guru]
Yes a paradox! The moon is round, and there are aliens in all corners!
Answer from Staff[guru]
most celestial bodies have round shape!
Answer from Roman Tick[guru]
Because the table is wooden))
Answer from Dadaware[guru]
We teach physics.
Answer from Abstract@ktsiya V.I.[guru]
look more closely...it's not round but oval)
and here are two points of view for your consideration)):
1)
There were answers about the spherical shape (gravitational forces in a vacuum force the liquid to take on a shape with a minimum surface area), but there is no single point of view regarding the method of formation. Cosmology considers two hypotheses: A) condensation from ownerless matter (interstellar hydrogen), exactly the same as planets, stars, etc.; B) under the influence of a gravitational carousel, a “droplet” came off from the still liquid Earth, turning into a natural satellite.
2)
she is sickle-shaped... although no, now it’s round... and she also has a mouth, nose and eyes... - This is the head of the great ancient hero!
It was once hot, and it was also rotating, so it took on a spherical shape.
good luck in choosing))
Answer from Elizaveta Chereshnyuk[newbie]
The moon is similar in shape to a lemon
Answer from Alex alex[newbie]
in order for it to become round it must at least spin, but it doesn’t spin,
Answer from Sergei Kaletsky[active]
because all planets are round
Answer from Serzh777[guru]
because it is a planet, and there are no square planets!)
Answer from Bob[guru]
Because the earth is also round
Answer from Farkhad[guru]
The rounded shape is inherent in all celestial bodies with gravity. This is the most energy-efficient form.
To understand how the Moon rotates, take a doll (it will be the Earth) and a car (it will be the Moon).
1) Place the doll on the table, take the car and drive it around the doll in a circle. If you were in the place of the doll, you would see only one side of the car all the time.
2) Now remove the doll and drive the car around the circle again, but watch it so that your eyes are at table level. The machine made full turn around its axis, and you saw all its sides.
The moon glows because it reflects the sun's rays. The Moon, together with the Earth, revolves around the Sun and around the Earth itself - therefore the visible part of its illuminated surface changes - from a full disk to a thin crescent, and this depends on all factors at once - both on the position of the Sun, and on the position of the Earth, and of course itself The moon, as well as on their relative position. On a new moon, we do not see the Moon at all, because it is turned towards us with its dark side. Then a thin sickle appears in the sky, it grows and turns into a crescent. Being behind the Earth (without falling into its shadow), a full disk is visible - the full moon is approaching. Then everything goes to reverse order. When the Moon is between the full moon and the new moon, it is called debilitated.
What is an eclipse?
Sometimes, as planets move around the Sun, they cast shadows on each other. The Moon, being between ours and the Earth, partially or completely covers the Sun. Its shadow falls on the Earth, and then comes solar eclipse. During a total eclipse, the sky darkens, and only the corona remains of the Sun, which can be seen through special filters. A lunar eclipse occurs when the Moon enters the Earth's shadow. However, the Moon does not disappear, but acquires a reddish tint, because the sun's rays scattered in the Earth's atmosphere fall on it.
Lunar crescent
If the crescent of the Moon is turned with a hump to the right and it can be turned into the letter “R” by placing a vertical stick at the tips of the “horns”, then the Moon is “R”-shaped. If the sickle has the shape of the letter “C”, then the Moon “C” is aging.
Why do we only see one side of the moon?
The Moon orbits the Earth in a counterclockwise direction, completing a full revolution in 27.3 days. It takes the same amount of time to turn around its own axis. That is why the Moon always faces us with one side, and it seems to us that it does not rotate at all. But try to observe the Moon as if from the outside.
Moon month
The period between two new moons is called lunar month. It lasts about 29.5 days.
The side of the Moon facing the Earth is colored yellow. Having made a full revolution around the Earth, the Moon also made a full revolution around its own axis.
Moon phases
On a clear, cold autumn night you go outside. The Moon had just risen, a huge round orange Moon. A few days later, you notice that the moon is no longer so round. A few more days pass - the Moon has turned into a horned moon. After two weeks, the Moon disappears altogether.
Why does the Moon change shape?
What happened? Why does the Sun always turn its round sparkling face towards us, and the Moon has phases? The moon passes them regularly every month, sometimes increasing and sometimes decreasing, like balloon, which is then inflated and then deflated.
In reality, of course, the Moon always remains a ball, invariably hard and rocky. What actually changes is the amount of the illuminated surface of the Moon that we can see.
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The Moon makes one revolution around its axis in almost the same time that it makes one revolution around the Earth (in 27/3 days), so the Moon almost always faces the Sun with only one side. But it is wrong to think that eternal night reigns on one side of the moon. Although slowly, the change of day and night still occurs.
Why does the moon glow?
What we call moonlight, In fact sunlight, reflected by gray rocky lunar surface. The Moon moves with the Earth around the Sun and is illuminated by the Sun. As the Moon moves, we see either a larger or smaller part of the illuminated surface of the Moon, that is, the position of the Moon in relation to the Earth is changing all the time.
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What we call the "phases" of the Moon are the angles at which we see the illuminated part of the Moon. When we see it completely, this position is called the full moon. When, after a few days, the Moon becomes “defective,” we already see part of its illuminated half (the first quarter after the full moon).
Then the Moon decreases by half, then a beautiful horned moon appears. When the completely dark half of the Moon comes into our field of vision, it seems to disappear altogether. This position is called the new moon. And indeed, through a short time we again see a silver sickle in the sky, the illuminated half of the Moon again enters our field of vision. The moon continues to increase in size and the whole cycle repeats. If you look closely at the sickle new moon, then you can see the rest of it, although it looks very dark.
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Why do eclipses happen?
To see full moon every night, you need to launch a rocket into space and hover in it over the illuminated half of the Moon, which will be clearly visible even when it is hidden from the eyes of the inhabitants of the Earth. Planets also have phases. Scientists, looking at Mercury and Venus through a telescope, observed them in the form of horned months. When the Earth was photographed from space, it was often spacecraft conveyed space images, in which our planet also looks like a defective Moon.
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THE MOON IS TOO PERFECTLY ROUND TO BE A SHARD PLANETS - THIS IS MY OBJECTION TO THE AMERICAN SCIENTIST
I am not at all convinced by the theory - that the Moon is a stub of a collision between the Earth and another planet - why? it is too perfect a ball - it is clear that it was formed in space and was drawn into the Earth's orbit rather due to own lung collisions with it - it may be objected that the irregularities after the impact were then decorated with dust from space... but the Earth is no less ancient creature and its dust did not turn the planet into a completely round one! - it looks like a compressed ball of paper - it’s all in potholes and the fact that it’s round is a decoration made of water... it means time has not made round earth- is not capable of making the Moon round - and if so, then this is clearly not a stub after the impact of some other planet... - but a guest from outer space...
Mysteries of the Moon's Birth Revealed
A small excess of tungsten in the rocks of the Earth's satellite helped geophysicists verify the correctness of the assumption
Geophysicists have received new confirmation of the hypothesis that appeared in the 70s. last century. According to it, the Moon was formed from fragments resulting from the collision of the Earth and a planet the size of Mars about 4.5 billion years ago. This idea was prompted by the similar composition of our planet and its satellite, as well as the almost complete absence of an iron core on the Moon.
Photo by Patrick Pleul / globallookpress.com
However, it was a difficult struggle to prove the validity of this hypothesis. For example, some scientists argued that the Earth and the Moon were formed simultaneously, others - that the Moon broke away from the rapidly rotating Earth, and still others - that they were formed in different parts solar system, and when the Moon came close to the Earth, it was captured by it.
But American professor Richard Walker managed to bring new arguments in favor of the hypothesis of a collision between the Earth and a large cosmic body. The missing compelling argument was one of the tungsten isotopes. It was the tungsten-182 isotope, found in the soils of the Moon and Earth, which appeared after the decay of hafnium-182, that allowed Walker to finally verify the validity of this hypothesis.
The scientist theoretically proved that if the Moon was really born after the collision of the Earth with Theia, then the proportion of this isotope in lunar rocks should be higher. And then he discovered this while examining rock samples brought to Earth by the Apollo 16 expedition. Moon rocks actually contain more tungsten-182 than the Earth's interior.
From which the geophysicist concluded that the Moon was born during the collision of the Earth with Theia, and their ejected matter was thoroughly mixed, judging by the lack of differences in the proportions of other isotopes.
Theia, a planet that previously existed in the solar system, was approximately the same distance from the Sun as the Earth. This is what allows scientists to believe that it chemical composition was very close to the composition of our planet.
Alexander BOLOTOV
The moon is natural companion Earth. And, as we have already found out in the framework of the relevant thematic entries on our website, it is called natural because it has a natural origin.
Today we want to consider several more very interesting issues related to our satellite in space.
Why is the moon round?
The first question that we want to consider concerns directly the shape of this celestial body. Why is the moon round? The fact is that most of the objects known to us, located in relative proximity to the Earth, are round in shape. This includes the Sun and other planets of our solar system. And there is a completely accessible and rational explanation for why planets and satellites have a round shape.
As scientists have found out, who have had a lot of time to put forward hypotheses and prove them, most cosmic bodies, planets and satellites, have a spherical shape due to the fact that this is a consequence of the influence of gravitational forces on the particles that make up their bodies. celestial bodies.
All this happens due to the fact that all particles are attracted to the central part of the body, accumulating into an array that acquires a spherical shape over time.
However, it should be noted that the Moon is not completely round. It looks more like an ellipse.
Why are craters on the Moon round?
Another question related to our natural satellite that we wanted to consider concerns the craters present on the surface of the Moon. All of us, in cloudless weather, have the opportunity to quite clearly observe the surface of the Moon. Even without the use of telescopes, spots can be seen on the lunar crust - these are craters.
Not everyone knows about this, but craters were formed on the surface of the Moon due to the collision of the Earth's satellite with meteorites. Millions of years passed before the Moon acquired the appearance that we have the opportunity to observe today. However, why are craters round in shape? Let's look into this issue.
The fact is that, regardless of the shape of the body that crashes into the surface, the explosion from the collision with the meteorite and the wave from the impact form the shape of a frozen circle at the point of impact. Therefore, if the falling meteorite does not pass tangentially, the craters in the Moon's crust after the fall remain exclusively round. Only the sizes of the circles can differ, which are directly proportional to the size of the meteorite itself that formed the crater.
