If something had landed on the moon now, would we have known?

I can't find it, and now human technology is not so godlike.

Truth be told, we don't even know how many planes land on Earth every day.

Taking a picture from the Earth's orbit of 300 kilometers like the ground has a resolution of the order of meters. The Moon is 1,000 times farther away than the satellite, and the largest telescope on Earth can see a larger mountain, and nothing can be seen in detail. If you talk about a folk telescope, it would be nice to be able to distinguish a small part of a particularly large crater.

What's more, the far side of the moon is never visible from Earth.

It takes several months for a probe to orbit the moon and scan the entire moon completely. Therefore, it is also impossible to monitor in real time.

No! We don't have a constant monitoring of the moon yet, only the possibility of an early meteorite impact and then an observation. If there are other spacecraft landing on the moon, we can't possibly know. That is not possible unless we discover the spacecraft in advance and are tracking it.

If there is indeed an extraterrestrial vehicle landing on the surface of the moon, then there are several questions that need to be confirmed:

1. Whether the time of landing (day, night) and location (moon surface, moon back) are within our monitoring range.

2. How much higher is their technology than ours, and can they detect their spaceship under our surveillance?

In fact, the earth has not been able to achieve all-round, all-weather monitoring, and the moon is even more impossible, and no country or organization has this capability.

To sum up, if it does happen, the probability of being detected is also very small.

There are many moon-orbiting satellites in many countries, such as China's Chang'e satellite, which observes the moon every day, as well as ground-based radio or optical telescopes, extraterrestrial space stations or space telescopes, and extraterrestrial vehicles landing will definitely be discovered.

Of course, I know that the impact of space junk on Mars a few years ago was clear and accurate.

I wonder which country has such an NB?

1. The rotation of the moon.

The Moon rotates while revolving around the Earth, and the period day is exactly a sidereal month, so we can't see the far side of the Moon.

This phenomenon is called "synchronous rotation", or "tide locking", and is almost a universal law in the world of solar system satellites. It is thought to be the result of the long-term tidal action of satellites on planets. The balance movement is a wonderful phenomenon that allows us to see 59% of the surface of the moon.

There are mainly the following reasons:

1. In different parts of the elliptical orbit, the rotation speed does not match the angular rotation velocity.

2. The intersection of the white and equator.

The Moon moves half a degree per hour relative to the background starry sky, i.e. it is similar to the apparent diameter of the Moon's surface. Unlike other satellites, the Moon's orbital plane is closer to the ecliptic plane than near the Earth's equatorial plane.

The time it takes for the Moon to orbit the Earth (one sidereal month) is called a sidereal month, relative to the background starry sky; Whereas the time it takes for a new moon to take for the next new moon (or between two phases of the same moon) is called a synodic month. The synodic moon is longer than the sidereal moon because the Earth itself travels some distance in its orbit around the Sun during its orbit.

2. The revolution of the Moon.

The Moon orbits the Earth in an elliptical orbit. The great circle of this orbital plane on the celestial sphere is called the "white path". The plane of the white channel does not coincide with the celestial equator, nor is it parallel to the plane of the ecliptic, and the spatial position is constantly changing.

Cycle day. The average inclination of the lunar orbit (white path) to the Earth's orbit (ecliptic) is 5°09. 、

Because its circular motion around the Earth cancels out the gravitational pull of the Earth.

The impact of the moon on the earth, life on the earth and human beings is very large, and if the moon disappears, there is a possibility that even the earth will no longer have life in the long run.

The tidal phenomenon of the earth's ocean is caused by the existence of the moon, if the moon disappears, the earth's tidal phenomenon will disappear, we see that the sea has no ebb and flow, and the flow of sea water will also slow down, such as ocean currents may also change, which will undoubtedly have an adverse impact on marine life and even fish.

The tidal effect of the moon on the earth is not only reflected in the ocean, but also in the atmosphere, and the earth's atmosphere will also produce tidal phenomena with the operation of the moon, which also accelerates the flow of the earth's atmosphere, especially the flow of Paihong's upper atmosphere, forming the so-called "air tide", which can affect the air pressure and thus have an impact on the weather.

If the Moon disappears, the following changes will occur to the Earth:

1. The Earth becomes longer: The Moon exerts a gravitational pull when it revolves around the Earth, causing the Earth to deform slightly, which slows down the Earth's rotation. If the Moon disappears, the Earth's rotation will increase and the length of the day will become shorter, potentially leading to large ecological and global economic impacts.

2. Sea level fluctuations: The gravitational pull of the moon affects the ocean tides on the earth, if there is no moon, the tides on the earth are no longer subject to the gravitational pull of the moon, and the height and period of the tides will change, which will lead to sea level fluctuations.

3. Increased probability of celestial collisions: The moon forms a stable gravitational field around the earth, reducing the probability of collisions between celestial bodies and the earth in the universe. If the Moon were to disappear, the Earth would be more vulnerable to comets, meteors and asteroids, which would lead to catastrophic consequences.

4. Ecological shadow bird button: The gravity of the moon on the earth also affects the climate and ecosystem on the earth, such as the temperature difference between day and night, weather, seasonal patterns, animal and plant reproduction and migration, and other auricorn systems. The disappearance of the Moon will bring the ecosystem into a new equilibrium state, which may affect the Earth's circulatory system, changes in environmental parameters such as temperature, air temperature, atmospheric pressure, etc., and bring unpredictable effects to the ecosystem.

In conclusion, if the Moon disappears, the Earth will undergo landmark and far-reaching changes that require further research to understand its effects and adjust and adapt accordingly.

If the moon. If the moon falls on the earth, then the earth will be greatly impacted, or even destroyed.

The Moon does not fall directly to the Earth, on the contrary, because the volume of the universe is still growing, the distance between the celestial bodies is slowly increasing, and the distance between the Moon and the Earth is constantly increasing.

It would be devastating if the moon fell on the earth, and the energy produced by the moon falling into the earth is incalculable enough to destroy the earth.

If the moon fell to Earth, it would be a devastating impact, and both sides would lose.

Putting aside science, the moon would destroy all life on Earth, if possible.

The reason for the lunar crisis in "The Wandering Earth 2" is the "gravitational slingshot" effect.

From the analytical plane, pushing away the moon and constantly doing elliptical motion with longer and longer focus, the perigee is getting closer and closer to the earth, and the apogee is getting farther and farther away from the earth, and finally at the limit of the semi-major axis, an acceleration is applied, and the moon can fly away and get rid of the shackles of the earth.

The "Lunar Crisis" problem in The Wandering Earth 2 appears at the time of acceleration, because the greater the eccentricity of this orbit, the closer the perigee is to the Earth.

According to calculations, the "Loch limit" of the Earth-Moon orbit is 10,000 kilometers, beyond this critical distance, the Moon will not be able to run away, and the Zhengxiang jujube will be torn apart by the Earth's gravity, and part of the wreckage will become a ring around the Earth, and most of it will be smashed to the Earth.

How the Loch Limit Situation is shown in the movie:

In the movie, the three engines suddenly failed when they were approaching the Earth, and they blew up one after another, and the Moon did not have enough speed to lift back into a higher orbit and plunged headlong into the Earth. Of course, this is not a "moon fall", but a spiral approach, which was finally torn apart.

There are also shots in the movie that show that a large number of lunar meteorites have landed on the earth, causing great damage to the surface, and this is just the skin, if it is the moon fragments in the limit of the Lochyan slag, it is tens of trillion tons, and the entire earth's crust will be overturned, and human civilization will come to an end.

A catastrophe causes a mysterious force to knock the moon out of orbit and towards Earth. With little time left, a squad of people from the lower levels of society launches the final blow to the moon, hoping to solve the mystery and save the planet from destruction.

The special effects of "Moonfall" are really very good-looking, but it is really unacceptable to transfer from a disaster film to a technology film. And when the moon is about to hit the earth, only three people flew into space to save the earth, and it really raised personal heroism!

After watching Moonfall, I'm glad it's just a movie. In recent years, natural disasters such as the sea is rolling and roaring, and volcanic eruptions have occurred frequently. Don't you know how to think?

1. Global warming.

Studies have shown that if the temperature rises by another 2 degrees, more than a quarter of the Earth's land, or more than 1.5 billion people, will fall into drought.

At the same time, the most immediate consequence of glacier melting is rising sea levels. In 2019, global mean sea level reached its highest value on record.

2. Wildfires in Australia.

From 2019 to 2020, an Australian bushfire destroyed nearly 6 million hectares of forest, killed 500 million animals, and lost many animal carcasses to the wild.

Wildlife has been devastated, and the entire ecosystem is out of balance.

3. Japan's Deep Sea **.

Japan's Deep Sea**: According to scientists from the U.S. Geological Survey, at 2:30 a.m. on September 20, about 281 kilometers from Japan's Fukushima Nuclear Power Plant, a deep sea** occurred, with an earthquake magnitude of about magnitude and a depth of one kilometer.

4. Tropical Storms "Kaisana" and "Parma".

Tropical Storms Kesana and Parma caused widespread flooding and landslides in several provinces in the Philippines, killing more than 500 people.

5. Snow flies in Brazil in July.

Brazil, where most of the country is in the southern hemisphere, had snow decades ago, but judging by the frequency of extreme weather events around the world, the rare snowfall in July in Babibusi is still unusual.

So, how much time do humans have left?