The Moon, that enormous silver disk that we see illuminate the Earth on clear nights, has fascinated human beings since time immemorial. It really is a natural satellite of our planet that has been studied by scientists from all over the world for many years. However, despite the fact that we have observed the Moon for centuries, we can only see the same face of her from Earth. This phenomenon has been the subject of study and research for decades, and it remains a mystery to many people. Why can we only see one side of the moon?
In this article we will talk about the reasons behind this fact and explain which is the reason why we see this satellite acquiring different forms. If you are interested in the subject, I recommend that you continue reading to discover the secrets that are hidden behind the hidden face of our natural satellite.
What phenomenon explains the difference between the two faces of the Moon?
Surely you have heard that the Moon has two faces. Turns out it's true! This expression is due to the fact that we can only see one side of this satellite, the other always remains hidden from Earth. But why can we only see one side of the Moon? Well, this satellite is in synchronized rotation with the Earth. This means that It takes exactly the same time to complete one rotation on its own axis as it does to orbit our planet. As a result, it always shows the same face towards Earth.
This phenomenon is due to the gravitational force exerted by the Earth on the Moon, which has generated a kind of gravitational "lock". Consequently, the Moon always presents the same face towards us. The effects of the tides and the gravitational attraction of the Earth on the Moon have slowed its rotation over time, until it has synchronized with its orbital period. Therefore, although the Moon rotates on its own axis, it does so in such a way that it takes exactly the same time as it takes to orbit the Earth.
To see the other side of the Moon, it is necessary to travel there. And how? To do so requires a spacecraft or an artificial satellite that is placed in lunar orbit. From our planet there is no way to see the hidden side of this satellite.
How was it possible to see the other side of the Moon?
Although it sounds very mysterious, andhe human being has already managed to explore and photograph the other side of this natural satellite, Also known as the hidden face of the Moon. The first time images of the far side of the Moon were obtained was in 1959, when the Soviet Luna 3 probe sent photographs of this area.
Since then, several space missions have managed to reach the hidden side of the Moon, including the US missions Apollo 8, Apollo 10, Apollo 11, Apollo 12 and Apollo 13, which orbited the Moon and provided valuable information on the topography and geology of the Moon. There are also more recent missions, such as the Chinese Chang'e 4 probe. It landed on the far side of the Moon in 2019 and has carried out various scientific investigations in this area.
Although exploration of this area remains a technological challenge Due to the lack of direct communication with Earth, future space missions are expected to continue exploring this lunar region to learn more about the Moon and the universe.
Why do we see the Moon in different ways?
Now that we know why we can only see the same face of the Moon, doubts may arise about why we see this satellite in different ways. Well, the appearance of the Moon is the same anywhere in the world, since it is a celestial object that is in space and is visible from anywhere on Earth. However, the position of the Moon in relation to the horizon and the perspective from which it is viewed may vary depending on the geographic location of the person viewing it.
Let's give an example: When the Moon is near the horizon, it appears to be larger due to an optical effect known as "moon illusion". This effect occurs because our brains interpret the size of the Moon in relation to other objects near the horizon, such as trees or buildings, which can give the impression that the Moon is larger than it really is.
Furthermore, the Moon's position in the sky varies depending on the latitude and longitude of the location from which it is observed. This means that the Moon may appear higher or lower in the sky depending on latitude, and its position may be different in the sky depending on longitude.
Moon phases
Let's now move on to another mystery: the lunar phases. From our planet, we can observe how the Moon takes on different shapes due to its position relative to the Sun and our planet. This natural satellite doesn't produce its own light, but rather reflects the Sun's light. When the Moon orbits the Earth, its position in relation to the Sun and our perspective from Earth change, producing different lunar phases.
The Moon completes one orbit around the Earth in about 28 days, which would be equivalent to one lunar month. During this time, the Moon goes through different phases, They are due to the amount of sunlight it reflects and the position of the Moon in relation to Earth and the Sun. When the Moon is between the Earth and the Sun, it is in the New Moon phase and cannot be seen from Earth. When the Moon is aligned with the Earth and the Sun, with our planet in the middle, it is in the phase of Full moon and it looks completely round and luminous.
Between the New Moon and Full Moon phases, there are several intermediates, such as the Crescent Moon, the Gibbous Moon and the Waning Moon. Each phase is characterized by more or less of the Moon being illuminated by sunlight, and therefore looking different from Earth.
I hope I have clarified why we can only see one side of the Moon.