Can anyone provide me with some celestial data

The distance between some celestial bodies and the Earth.

The average distance between the Sun and the Earth is ——

The average distance of the Moon from the Earth is 384,400 km

The distance from Earth from the nearest star outside the solar system (Proxima Centauri, C in the constellation South of Gate) is light-years.

Generally speaking, it is enough to memorize the above three.

First cosmic velocity.

Second cosmic velocity.

Third cosmic velocity.

Electromagnetic waves in the visible and radio bands can be observed in the atmosphere.

The wavelength of the former is between 400-760nm, and the wavelength of the latter is more than 1m.

However, it is possible to observe the full range of wavelengths without leaving the atmosphere. (e.g. ray, x-ray, ultraviolet, infrared, microwave and other bands).

Hubble's law v hd (v is the regressive velocity, d is the distance, h is the Hubble constant).

Hubble's law has a wide range of applications, and it is the only effective way to measure the distance of galaxies. As long as the redshift of the spectrum of a galaxy is measured and the regression velocity is calculated, the distance of the galaxy can be calculated by Hubble's law.

The Hubble constant is estimated at 73 kilometers per second per million parsecs (1 million parsecs equals about 3.26 million light-years). In other words, a galaxy at a distance of 1 million parsecs will recede at a speed of 73 kilometers, which is the rate at which the universe expands.

Density determination. The density of a celestial body can be found by using the law of gravitation to determine the mass of a celestial body and to determine its radius or diameter, i.e., =m v=m (4 r 3 3).

Kissing ......I've used this word to make a foreign appearance, and the title is: Hello! I don't think of anything else just yet.

The economic losses caused by environmental pollution to China are as high as 68 billion yuan per year, which is equivalent to the losses caused by the eight Tangshan Congresses. Today, humans are emitting 23 billion tonnes of carbon dioxide into the atmosphere every year, a 25% increase since the beginning of the 20th century. The large increase of pollutants such as carbon monoxide and sulfur dioxide in the atmosphere not only endangers human health and affects the normal growth of animals and plants, but also causes the temperature in our body to rise.

The large amount of exhaust gas has also seriously damaged the ozone layer, which is as large as the territory of the United States and as high as Mount Everest. Due to the lack of protection from the ozone layer, the amount of ultraviolet rays reaching the ground has increased significantly, and the number of cancer and disease patients has increased significantly.

Beginning in March 2000, over a period of more than 40 days, sandstorms hit Beijing, the capital of China, seven times, with winds reaching a maximum force of 8. On March 24, the wind and sand hit Nanjing, Suzhou, Yangzhou and other eight cities crossed the whole territory of Jiangsu and went straight to Shanghai, and on the 28th, Shanghai fell a "mud rain". The wind and sand obscured the sky and the sun, and houses collapsed and trees were broken, killing dozens of people.

In the 21st century, the Earth's forest cover will be several times less than in the 20th century, with a decrease in forest cover and an increase in human carbon dioxide emissions to the planet. When carbon dioxide gas doubles, the Earth's temperature will rise. By 2050, the resulting greenhouse effect will increase global mean sea level by 20 cm.

By 2100 it will rise 65cm; The destruction of the ozone layer increases the chance of direct exposure to ultraviolet rays, which can cause macular degeneration in the fundus, and if ozone continues to decrease by 6%, the number of people blind due to cataracts will increase by 166,175 million per year. If this development continues, it will be difficult for human beings to adapt to the earth's environment in the 21st century.

Know the passing of Lop Nur? Do you know that the sea level of the Green Lake is dropping? Did you know that Crescent Spring is on the verge of drying up? The same tragedy continues, what other examples of ecological deterioration do you know?

There are 350 species of birds in Heilongjiang Province. In recent years, due to the rapid development of agriculture and fisheries, and the destruction of the natural environment, the habitat of birds and the environment of breeding grounds have deteriorated and shrunk. At present, 68 species of birds such as falcons, cranes, storks and grouses are endangered, including whooper swans, white-headed cranes, black storks, Chinese mergansers, black-billed grouse, great bustards, etc.

Known as the "Pearl of Treasure Island", the Songtao Reservoir is responsible for the irrigation of more than 2 million acres of farmland, as well as the flood control safety of nearly 2 million people and 560,000 acres of farmland in the lower reaches of the Nandu River, and also provides 100 million tons of industrial and domestic water to Yangpu, Laocheng, Haikou and other places every year. However, it is worrying that the ecological environment of the Songtao Reservoir is being destroyed, and illegal deforestation and mining incidents have been repeated in recent years. Standing on the pier of the reservoir and looking around, the scene in front of you is shocking.

Some of the originally densely forested hills and slopes around the reservoir have been shaved with unsightly baldness and scars.

At present, China's desertified land has reached more than 10,000 square kilometers; The cultivated land and homes of 471 counties and nearly 400 million people in 18 provinces and autonomous regions of the country are threatened by desertification to varying degrees, and desertification is still increasing at a rate of more than 10,000 square kilometers per year.

Among the seven major river systems, the water quality has no use value at all has exceeded 40. More than 400 of the country's 668 cities are in a state of water shortage. Many of them are caused by water pollution.

For example, Ningbo City, Zhejiang Province, is located at the intersection of the Yongjiang River, Yao River and Fenghua River, but due to water pollution, it is necessary to rely on water trucks to run day and night when there is the most water shortage, and transport the water from the rural river into various enterprises in the city.

China's average industrial added value of 10,000 yuan consumes 330 cubic meters of water and produces 230 cubic meters of sewage; For every 100 million yuan of GDP created, 10,000 tons of wastewater will be discharged. There is also a large amount of domestic sewage. More than 80 of them are discharged into rivers without treatment, and within 10 years, China will have no water to use.

1 3 of the country's urban population breathes heavily polluted air, and 1 3 of the country's land is eroded by acid rain. In economically developed Zhejiang Province, the acid rain coverage rate has reached 100. The frequency of acid rain is 11 in Shanghai and 12 in Jiangsu.

In central China and some southern cities, such as Yibin, Huaihua, Shaoxing, Zunyi, Ningbo, Wenzhou, etc., the frequency of acid rain exceeds 90.

In China, the maximum allowable sulfur dioxide emissions for the basic elimination of acid rain pollution are 12 million 14 million tons. In 2003, the country's sulfur dioxide emissions reached 10,000 tons, an increase of 12 over 2002, of which industrial emissions increased. At the current rate of economic development.

By 2020, the country's thermal power plants alone will emit more than 21 million tons of sulfur dioxide, and all emissions will exceed the atmospheric environmental capacity by more than 1 times, which will be a serious disaster for the ecological environment and people's health.

Environmental pollution has caused economic losses of up to 68 billion yuan to China. Now. Humans emit 23 billion tons of carbon dioxide into the atmosphere every year.

In 2001, the Intergovernmental Panel on Climate Change (IPCC), established by the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP), published its Third Assessment Report. According to the report, the average global surface temperature has risen since 1860, and the last 20 years have been the warmest in the past 100 years.

And the 90s were the warmest decade in 1,000 years. In the context of global warming, China's climate has also undergone significant changes in the past 100 years, mainly in the following ways: the trend of climate change in China in the past 100 years is basically consistent with the overall trend of global climate change, and the temperature in China has risen in the past 100 years.

From the perspective of geographical distribution, the most obvious areas of climate warming in China are in Northwest, North China and Northeast China. From the perspective of seasonal distribution, the winter warming in China is the most obvious. According to the latest data from the National Climate Center of the China Meteorological Administration, since 2004, China's temperature has generally been higher than that of the same period in normal years, and it has become a "foregone conclusion" to become a warm winter, which means that China will experience the 19th warm winter in the past 50 years.

1) Land-based pollutants: According to the statistics of relevant departments, about 6 billion tons of industrial sewage and domestic sewage are discharged into the sea every year in China's coastal areas. Among the domestic sewage, the East China Sea coast has the largest discharge, followed by the South China Sea coast and the Bohai Sea coast, the Yellow Sea coast is the smallest, and the East China Sea coast has the largest discharge in industrial sewage, accounting for 50% of the total. The Bohai Sea coast and the South China Sea coast are the second, and the Yellow Sea coast is the least.

2) Pollutants discharged by ships: China has more than 100,000 motor vessels of various kinds, tens of thousands of foreign ships entering China's ports and sailing through the waters under China's jurisdiction every year, and a large amount of oily sewage is discharged into the sea. For example, in 1979, Brazilian oil tankers operated at the Qingdao oil terminal, running 380 tons of oil at a time.

3) Pollution from offshore oil exploration and development: There are several large oil fields and more than a dozen petrochemical enterprises along the coast of China, and the amount of oil that runs, runs, drips, and leaks is considerable, with more than 100,000 tons of oil entering the sea every year.

4) Pollution by manual dumping of waste: In the past, the ocean was used as a big "garbage bin" to dump waste arbitrarily. For example, on the coast of Dalian Xianglujiao, Huludao, Qingdao, Wenzhou, Zhanjiang and other places, garbage, slag and other wastes are piled up on the seashore or directly poured into the sea.

5) Unreasonable construction and marine development: This has caused the siltation of some deep-water ports and waterways, and the ecological balance of local sea areas has been destroyed.

There are more than 200 pollution sources of various types along the coast of China, more than 100 along the coast of the Bohai and Yellow Seas, and about 100 along the coasts of the East and South China Seas. These sources of pollution discharge into the sea are important pollution.

petroleum hydrocarbons, heavy metal pollutants and organic pollutants. Rivers carry pollutants into the sea as the main route.

Hello, my answer is as follows:

Put garbage in an open area.

Douse with gasoline. Just throw a match and burn it.

Good afternoon! Is it to write ** or do market research? As a buyer who has bought something online and has seen other friends shopping online, I would like to give you a small reference.

1. It is customary to brush fake and cautious reputation on **, which leads to the lack of trust of many people in **shopping;

2. When buying things in **, many times you can't find out the status of logistics in time, and I don't know if the seller has no goods at all and sends a fake tracking number or the reason for logistics;

3. I have encountered many friends who have bought fake mobile phones and other fakes and knockoffs;

4. I used to think that B to C online **must be**, from when dangdang sells fake Apple mobile phones, some **sell fake Casio mobile phones, etc., I found that now B to C online ** is not absolutely reliable.

5. After buying digital products online, they cannot be tried when they are delivered, which is a deficiency for consumers. You can try it when you buy a mobile phone in a physical store, so why can't you try it if you buy it online?

If China's online shopping is not improved, it could destroy China's e-commerce industry. Consumers would rather buy something in a physical store than online.

If China's e-commerce wants to develop benignly, it will get better and better. At a minimum, the following are the following:

1. Adopt a comprehensive approach to strictly supervise sellers to prevent the phenomenon of swiping fake reputation and selling fake goods;

2. When buying things online, consumers should be able to keep abreast of the latest delivery of goods;

3. If some buyers borrow to buy things to defraud the seller's money, this should also be severely punished;

4. Express transportation should be convenient and fast, do not buy a commodity, and wait for ten days or half a month to not send it;

5. The express company should also strictly manage its internal employees to prevent the phenomenon of stealing the goods of buyers or sellers;

The main subjects involved in e-commerce are:

1. Sellers and merchants; 2. Buyers; 3. Online ** manager; 4. Express delivery companies; 5. Other relevant departments.

These five aspects must be coordinated and managed well.

The above is just a small insignificant insight, I hope it can help you.