Why doesn't space junk fall down?

Space junk is a very dangerous thing, which is caused by human beings in the process of launching space stations or satellites. Because it floats in space, similar to a meteorite, it will be attracted by the earth and fall back to the ground or hit the satellite at any time, which will bring inconvenience to the use of the satellite. Therefore, it is forbidden to make space junk in the world.

Space junk has been floating in space. The earth is too far away from other planets, will it lose its gravity on space junk?

Some explain that a satellite can move around the earth at a constant speed endlessly as long as it controls its distance from the earth so that its gravity is just equal to its centripetal force, but space junk is out of control, how can it float in space? Also, when the spacecraft leaves the earth and enters space at a certain height, astronauts and movable objects can see weightlessness, indicating that the farther away from the earth, the smaller the gravity of the earth on the object, and the farther away it is, the gravity will disappear! Does weightlessness mean that gravity has disappeared?

1. Gravity is just equal to its centripetal force, which allows the satellite to make a constant circular motion around the earth endlessly. That's half right, centrifugal force, but centrifugal force is only related to the mass, instantaneous speed and moving radius of the satellite. After the satellite is out of control, the space air is thin, the resistance is small, and the speed can be maintained for a long time. When you reach a certain speed in space, you won't fall, but the speed will decrease.

Gravity is not getting farther and farther away from the earth, but the gravity of the ball is equal to centrifugal force. Gravity can be said to be falling, but it will never fall. Gravitation is only related to mass and distance, and weightlessness is just an opposite and equal force, which will never disappear.

Will space junk fall by itself?

Space junk will fall down. In fact, a large amount of space junk enters the atmosphere every year. Generally small ones burn in the atmosphere. Generally speaking, space junk refers to man-made objects that can orbit the earth but are useless. At present, about 400 pieces of space junk fall into the earth every year.

Will space junk fall down?

Space junk is very harmful to the normal use of satellite space station. A wrench hit head-on, equivalent to the power of a Grenade. This is also potentially dangerous to the ground.

Satellites or space junk hover in the sky at high speed under the action of gravity. The thin atmosphere in outer space or other factors will slow down the object, reduce the centrifugal force, and then the object will get closer and closer to the earth and eventually burn or fall into the sea.

Man-controlled aircraft such as satellites will not fall down, because they have small engines and increase their speed from time to time to return them to their original orbits.

Who was the first person to die in space in China?

1957, Soviet astronaut Ledovski Kay took off from Kapustin Yar missile range not far from Volga River and died while flying in suborbital space. 1958, astronaut Sha Bolin died while trying to complete the same flight. 1959, astronaut Mitkov died while trying to complete the third suborbital flight. In addition, an unknown astronaut failed to return from orbit after he rose into space in May 1960, when his orbital module flew into high orbit.

The real photos of the earth are too scary.

The real photos of the earth are too scary.

The photos of the real earth are too scary. Many people are very satisfied with the earth we live in, but with all kinds of pollution, our earth has become ugly. Next, I will take you to know the horrible photos of the real earth.

The photos of the real earth are too scary 1

Overseas media said that many people's impression of the earth is probably beautiful water blue, but in fact that photo is "PS". Recently, the Japanese meteorological satellite Sunflower 8 took a detailed image of the earth, which is the first photo showing the true color of the earth.

On February 24th, 65438 in Taiwan Province Province, the British Daily Mail reported that the meteorological satellite Sunflower 8 was launched on June 24th, 65438+1October 7th. Recently, an image was taken at a distance of 35790 kilometers from the Earth, showing the details of clouds, oceans and deserts. With super high resolution, this is the first original picture of the earth without any color modification.

Japanese satellites photographed the real face of the earth.

In the past, people's impressions of the water-blue earth came from this photo.

In the public's impression, the water-blue earth is actually a color-corrected photo taken by NASA, which is very different from the gray earth taken by Sunflower 8. However, this so-called "true color" photo does not refer to the image seen by the naked eye, but the real face of the earth in space.

"@ NASA Chinese" also published a photo of the earth without makeup, which surprised netizens. It is uneven, with one concave here and one convex there. Generally speaking, some netizens said it was like a sweet potato, some netizens said it was like a spare tire, and some netizens said it was like a pomegranate.

For this photo, astronomical experts said that the earth is really not an authentic sphere, and its appearance is a bit strange. The reason why the earth is so long is that it not only revolves around the sun, but also rotates. There is both land and water on the surface of the earth. In order to maintain the internal gravity balance, all parties grow into this strange shape under the "struggle".

In fact,

Now, scientific means are developed, which opens up many ways for earth survey. Through actual measurement and analysis, accurate data are finally obtained: the average equatorial radius of the earth is 6378.38 km, and the polar radius is 6356.89 km. It is also found that the Arctic is about 18.9 meters high and the Antarctic is 24 ~ 30 meters low. It seems that the earth is shaped like a pear: its equatorial part protrudes, which is its "pear body"; The North Pole is a bit sharp, like "pear pedicle"; The South Pole is a little concave, like a "pear navel", and is called "pear-shaped earth". To be exact, the earth is a triaxial ellipsoid.

Real earth photos are too scary 2

We are always talking about finding extraterrestrial civilization and emigrating to other planets. We are always eager to emigrate to the stars. However, it is pessimistic that up to now, although more than 4000 exoplanets have been discovered, only the earth is still the only known planet with life suitable for human survival. In our stereotype, since man took the first panoramic photo of the earth by satellite 43 years ago, the earth has always been a vibrant blue planet with completely different oceans and continents.

43 years ago, when the first panoramic photo of Zhang Weixing was released in the world, people were shocked by the beauty of the earth, and we were proud of it. More than 70% of the oceans are covered by dense forests on land, which makes our earth like a fairyland, blue and green, colorful and well-defined. Since then, this beautiful image has been engraved in our minds, lingering. Forty-three years have passed, and our earth has not changed at all. Is it really still that beautiful?

In 43 years, the earth has changed. You may not believe it. The earth has changed in less than half a century. It has lost its beauty, even beyond recognition. Yes, the earth has become ugly now, and its appearance has been destroyed by human beings. You may not believe it, but it's true.

Due to the different social division of labor, for most people, there is actually no chance to go directly into space to see the true face of the earth, and even the original photos taken from space at first hand have no chance to see it. All we can see is the processed information and release.

Yes, the earth is beautiful, but that was in 1978, when humans photographed the earth. It's really beautiful, with a clean atmosphere and a vast blue ocean. At that time, the damage caused by human beings to the earth was really small, and there was almost no impact. At that time, the earth had enough ability to digest and deal with environmental problems caused by human beings, but now it has changed, and our destructive power has exceeded the capacity of nature.

In recent years, with the development of human society, we have indeed paid a huge price. Looking at the earth from space, the ocean is not so blue, the land is not so green, the atmosphere is not so normal, and the earth is a little grayish brown.

This is just the interior of the earth. Do you know that outer space is not pure land? In recent years, with the increasing dependence of mankind on artificial satellites, a large number of spacecraft have flown into space and successfully put into normal use, and failed or failed to become space junk. So it is conceivable that our earth has a layer of high-speed garbage. The space environment is inherently dangerous and complicated, especially after there is so much man-made space garbage, the earth is even more dangerous. In particular, we are almost helpless about space junk, and there is no way to recycle it, so "space junk" will only increase.

There are more than 200 countries and regimes in this world, and everyone has complicated relations and interests, but we should remember that the earth is our home. Before we have the ability to create a new star, we should protect it well, because it is the foundation of all of us. We should keep the ocean blue, the sky clean and the earth evergreen. We should not give up environmental protection completely for the sake of economic development, because we must suffer in the end.

Our earth belongs to us, but it belongs to those descendants after all, so do you think we should protect it in time in the face of the deteriorating earth environment?

Real earth photos are too scary 3

1. Today there are 7.38 billion people in the world. With the continuous growth, it is estimated that the global population will exceed 1000 billion in 2056! This picture shows the current situation of overpopulation in Mexico City. It is the result of more than 20 million people living in a city!

2. Because of the demand for animal products, there are many illegal hunting incidents in Africa every day. Elephants and rhinos are slaughtered in various cruel ways to meet the illegal animal products market of ivory and rhinoceros horn!

Every two seconds, a forest the size of a football field disappears. The main reason is the forest fire!

There are many tracks left by airplanes in the sky of London.

A giant truck carrying oil sands will send the oil sands to be processed, which is regarded as one of the important energy sources in the future world.

6. The oil sands in Alberta, Canada left a devastated surface.

7. A shepherd in Inner Mongolia can't stand the stench of the polluted Yellow River.

8. A landfill in Bangladesh.

9. Extreme climate causes frequent wildfires in Colorado, USA, and forest fires cause serious casualties and economic losses to the world every year.

10, the night view of Los Angeles looks beautiful, but the price behind beauty is endless energy demand.

1 1. In Oregon, the Millennium forest was razed to the ground just to build a new dam.

12. In order to grow crops that are not suitable for the local climate, the Spanish almeria has built endless greenhouse farmland, in order to let local residents eat the food they want.

13, Russia once discovered the largest diamond mining area in the world, but after mining, it also left Russia with the largest abandoned mine pit in the world.

14, photographer ChrisJordan found albatross bodies everywhere in Midway Island. The belly of the dead albatross is stuffed with a lot of plastic garbage. Ironically, Midway Island is the farthest island from the land in the world, which proves that the garbage made by human beings every day is ubiquitous and harmful!

15, facing the same overpopulation problem as Mexico City, New Delhi, India has a population of more than 22 million. Looking at pictures in the air will definitely make people with intensive phobia bow their heads!

16. The Maldives, a paradise on earth, will be submerged by seawater in this century under the threat of rising sea level.

17. Tens of thousands of tons of e-waste are transported to third world countries every day. Toxic substances in electronic parts not only squeeze the local people, but also seriously endanger the health of the local people!

18, Canada's virgin forests are also being cut down and burned day by day!

19, Nevada, USA, used for stacking waste tires.

20. The disappearance of Arctic ice makes polar bears lose the platform for hunting seals. Polar bears who can't find food can only eat their cubs to satisfy their hunger and finally starve themselves to death.

2 1. The oil fields in California, USA were ruthlessly exploited by human beings until they were completely exhausted!

22. Glaciers in the Arctic and Antarctic are melting at an alarming rate every day. The disappearance of the ice layer reduces the ability to reflect sunlight, and the seawater absorbs sunlight and heats up to accelerate the melting of the ice edge!

23. It is an undeniable fact that burning fossil fuels aggravates global warming and leads to climate change.

There is an old Indian proverb that says very well, "Only after cutting down the last tree, catching the last fish and polluting the last river will we understand that money can't be used to eat"!

Why can't women have children when they come back from space?

Because there is a lot of radiation in outer space, female astronauts may have radiation left in their bodies during their work.

Why are female astronauts forbidden to give birth after performing space missions?

In the process of exploring the universe, the existence of female astronauts is indispensable. They should not only have good physical fitness, but also be able to withstand sudden changes in the outside world. In the process of recruiting female travelers, NASA said that we should carry out space life science research, and it is incomplete without women's participation. As the 1 th astronaut in China, Liu Yang's physical and psychological qualities meet the standards, but it will take a long time to recover after returning to Earth, which shows that the radiation in space will have extremely adverse effects on the astronauts' bodies. It is not absolute to say that astronauts are forbidden to have children when they return to earth, but they cannot have children until their bodies return to normal.

Why radiation causes cancer.

There is a lot of radiation in space, which will seriously damage the function of human cells, make them mutate forcibly and even cause cancer. For women, physical fitness is weak. If they work in space for a long time and return to earth to have children immediately, there will be other problems. Moreover, in the process of working in outer space, astronauts should not only consider the influence of microgravity environment on human skeletal cells and muscles, but also consider the cancer risk caused by cellular microenvironment. Space is full of energetic particles and deadly particles in the form of energetic nuclei.

Radiation in space.

Astronauts should wear thick down jackets when they are in space to ensure the life safety of astronauts. In addition to keeping warm and providing oxygen, spacesuits also have a very important function, which is to isolate radiation. At present, it seems that no space creature can survive in the extreme environment of space without any protective measures.