More than 5 words of space knowledge.

1. The knowledge about aerospace is shorter

A series of advanced and complicated construction procedures created by aerospace technology for the smooth progress of aerospace activities. It involves the allocation of human resources, the collocation and installation of equipment and instruments, and other difficult academic assignments. It is the high pursuit of the development of the country, the nation and even the whole mankind.

electronic system is one of the important systems in modern aviation and aerospace engineering.

it is divided into communication, navigation, radar, target recognition, telemetry, remote control, remote sensing, fire control, guidance, electronic countermeasures and other systems. Generally, all kinds of systems include the electronic system on the aircraft and the corresponding ground electronic system, which are combined into a system through electromagnetic wave transmission signals. Electronic theories and technologies related to these electronic systems include communication theory, electromagnetic field theory, radio wave propagation, antenna, detection theory and technology, coding theory and technology, signal processing technology, etc., while microelectronics and computer technology are the basis for improving the performance of various electronic systems. Their development makes the electronic system on the aircraft further miniaturized and has the ability to process a larger amount of data in real time, thus greatly improving the performance of the aircraft (maneuverability, fire control ability, all-weather flight, automatic landing, etc.) and expanding the functions of the spacecraft (scientific exploration, resource survey, communication broadcasting, reconnaissance and early warning, etc.).

1. The characteristics of electronic equipment on aerospace vehicles are:

1. Small size, light weight and low power consumption are required; ② Able to work in harsh environmental conditions; ③ High efficiency, high reliability and long service life. These requirements are especially strict on high-performance aircraft and spacecraft. The cabin volume, load and power supply of aircraft and spacecraft are strictly limited. For every kilogram of equipment on the satellite, the launching weight of the launch vehicle will increase by several hundred kilograms or more. Missiles and spacecraft are subject to severe impact overload, strong vibration and particle radiation. Some spacecraft work for a long time, such as geostationary communication satellites for 7~1 years, while deep space probes work for a longer time. Therefore, electronic components used in aerospace have to undergo very strict quality control and screening, and the design of electronic systems needs to make full use of reliability theory and redundancy technology.

Second, the main development direction of aerospace electronic technology is:

① Make full use of electronic computers and large-scale integrated circuits to improve the integration, automation and intelligence of aerospace electronic systems; ② Improve the ability of real-time signal processing and data processing and the speed of data transmission; (3) developing high-speed and ultra-high-speed large-scale integrated circuits; (4) developing electronic technology in higher frequency bands (millimeter wave, infrared, optical frequency); ⑤ Develop various electronic components with higher reliability and longer service life.

2. Space shuttle information is less than 5 words

The space shuttle is a manned and reusable vehicle that carries people to and from near-earth orbit and the ground. It can not only take off vertically like a launch vehicle, but also land at the airport after returning to the atmosphere like an airplane. The space shuttle consists of orbiter, outer tank and solid booster.

The space shuttle provides a good tool for human beings to enter and leave space freely. It is an important milestone in the space history and was first developed by the United States. Famous space shuttles include Columbia, Challenger, Discovery, Atlantis and Endeavour in the United States, and Blizzard in the former Soviet Union.

Extended data

Features and uses

Compared with ballistic launch vehicles, the space shuttle has the following advantages:

1. It can be reused.

2. The maintenance is convenient and the emission process is simplified, which is conducive to the regularization and rapid response of space activities.

3. It is flexible to perform tasks. The space shuttle is equipped with various upper stages, which can meet the requirements of launching various low, medium and high orbit satellites and interstellar probes.

4. It can simplify the satellite design, improve the reliability and prolong the service life, thus reducing the total cost of satellite development.

5. The ascent and reentry phases are slightly overloaded, so ordinary people without strict space flight training can also participate in space activities.

Sogou Encyclopedia-Space Shuttle

3. Little knowledge of science and technology (about 5 words)

Meteorite is a stone body scattered on the earth by cosmic meteors out of the original orbit or in pieces. It is a precious and rare physical specimen for human beings to directly understand the stars in the solar system, which is of great collection value.

according to the observation of Canadian scientists for 1 years, there are more than 2 tons of meteorites landing on the earth every year, about 2, pieces. Because most meteorites fall in sparsely populated areas such as oceans, weeds, forests and mountains, only dozens of meteorites are found and collected every year, and the number is very small.

Meteorites, when they don't fall into the earth's atmosphere, are rocky, iron or a mixture of stone and iron that are free from outer space. If they fall into the atmosphere, they will become the meteorites we usually see when they fall to the ground without being burned by the atmosphere. Simply put, the so-called meteorites are the debris left by a miniature asteroid "hitting the earth". China is the first country to find meteorites in the world, as far back as the Neolithic Age, and then through the dynasties, until the end of the 2th century, there were written records, and there were many names marked with "falling stars", such as "falling star mountain" and "falling star lake".

meteorites are generally divided into three categories according to their composition, that is, iron meteorites, also known as meteorite. Generally, the content of iron and nickel is above 95, including 8 to 95 iron and 5 to 2 nickel.

the density is 8 to 8.5. Other components can include sulfide, diamond, rare earth elements and silicate.

iron meteorites account for about 3% of the total meteorites. The world No.3 iron meteorite was discovered in qing he, Xinjiang, China at the end of 19th century, with a size of 2.42*1.85*1.37 and a weight of about 3 tons.

this meteorite contains 88.67 iron and 9.27 nickel. It contains many kinds of minerals that are not found on the earth, such as conopyrite, taenite and other cosmic minerals.

Supernovae Sometimes, looking at the starry sky, you may be surprised to find that a bright star has never been seen before in a certain star area! However, after only a few months or even days, it gradually disappeared. This "strange" star is called a nova or supernova.

In ancient times, it was also called "guest star", which means that it is a "visiting star". Novas and supernovae are a category of variable stars.

When people saw them suddenly appear, they were once thought to be newly born stars, so they were named "new stars". In fact, they are not only newborn stars, but on the contrary, they are old stars that are dying.

In fact, they are the red giant stars that are exploding. We have mentioned more than once that when a star enters old age, its center will shrink inward, while its shell will expand outward, forming a red giant.

The red giant star is very unstable. One day it will explode violently, throw off its shell and reveal the white dwarf or neutron star hidden in the center. In the Big Bang, the star will throw off most of its mass and release huge energy at the same time.

In this way, in just a few days, its luminosity may increase by hundreds of thousands of times. Such a star is called a "new star". If a star explodes more violently, its luminosity can even increase by more than 1 million times. Such a star is called a "supernova".

the intensity of supernova explosion is unbelievable. It is said that it pours out as much energy in a few days as a young star radiates in hundreds of millions of years, so that it looks as bright as an entire galaxy! The explosion of nova or supernova is an important part of celestial evolution.

It is a splendid funeral for old stars and a promoter of new stars. The explosion of supernovae may trigger the birth of countless stars in nearby nebulae.

On the other hand, the ashes of nova and supernova explosions are also important materials for the formation of other celestial bodies. For example, many material elements on our planet today come from stars that have long since disappeared.

the sun is 1.3 million times the size of the earth, and it is the central celestial body in the solar system. An ordinary star in the Milky Way.

the average distance from the earth is 149.6 million kilometers, the diameter is 1.39 million kilometers, and the average density is 1.49 g/cm? 3. The mass is 1.989 * 1 33 grams, the surface temperature is 577 Kelvin, and the center temperature is 15 million Kelvin. From inside to outside, there are solar nuclear reaction area, solar troposphere and solar atmosphere.

thermonuclear reactions are constantly taking place in its central area, and the energy generated is radiated into space. One of the 2.2 billion energy is radiated to the earth, becoming the main source of light and heat on the earth.

the Sun is an ordinary star, and it has spent about half of its main sequence career on the Herro diagram. It is a hot gas (strictly speaking, plasma) ball with a mass of 198.91 billion tons (about 33, times the mass of the earth) and a diameter of 1.392 million km (about 19 times the diameter of the earth).

its average density is 1.4 times that of water, but this average density implies a wide density range, from ultra-high density core to thin outer layer. As a star sun, its overall appearance is that its luminosity is 38.3 billion watts and its absolute magnitude is 4.8. It is a yellow G2 dwarf with an effective temperature equal to 58 degrees Kelvin.

the average distance between the sun and the earth orbiting it is 149,597,87 km (499.5 light seconds or 1 astronomical unit). By mass, its material composition is 71% hydrogen, 26% helium and a small amount of heavy elements.

The angular diameter of the sun's circular surface in the sky is 32 minutes, which is very close to the angular diameter of the moon as seen from the earth. It is a wonderful coincidence (the diameter of the sun is about 4 times that of the moon and the distance from us is just 4 times that of the earth and the moon), which makes the solar eclipse look particularly spectacular. Because the sun is much closer to us than other stars, its apparent magnitude reaches -26.8, making it the brightest celestial body on earth.

The sun rotates once every 25.4 days (average period; The equator rotates faster than high latitudes) and revolves around the center of the Milky Way once every 2 million years. The sun is slightly flattened due to its rotation, which is .1% different from the perfect sphere, which is equivalent to a difference of 6km between the equatorial radius and the polar radius (the difference is 21km for the earth, 9km for the moon, 9km for Jupiter and 55km for Saturn).

Although the difference is small, it is important to measure this flatness, because any slightly larger flatness (even .5%) will change the influence of solar gravity on Mercury's orbit, making the test of general relativity based on Mercury's perihelion precession unreliable. You think it's too long. You can take a little off the middle.

4. Space tips

Hehe, I want to take part in this competition, too.

I found it, so.

I won't tell you! Forget it, I'll tell you! 1. Be healthy. Do high-intensity physical exercise every day, at least run for two miles (about 3.2 kilometers), ride a bike for 15 minutes, swim five times in the 5-meter lane, and lift weights for 15 minutes without interruption. 2. Teamwork and learn to get along with others.

Spacecraft is very small, so you must know how to live with other crew members. 3. Foreign language proficiency and basic Russian.

but it's not that simple. Mark Shuttleworth, a South African rich man who spent a lot of money on a Russian spaceship for space travel in 22, once said that a four-hour Russian course every day is like an operation on the brain.

4. It is necessary to have a good physical examination. Heart patients are definitely not allowed to go to heaven, but mild asthma will not affect them.

5. Psychological examination is also very important for mental health, especially for keeping calm under any circumstances. An astronaut may face all kinds of dangers, but there is nowhere to escape in space.

6. Overweight endurance training requires astronauts to maintain normal breathing and thinking ability under the condition of 8 times their own weight. This kind of training is usually done in a high-speed rotating centrifugal chamber or a rotating seat. The biggest pressure in training is to bear acceleration, while the training of astronauts requires overload to reach 8 times the gravity of the human body, lasting for 4 to 5 seconds.

In manned space flight training, overweight endurance training is the biggest challenge to astronauts' self-limit, which is a famous devil training, and many people discourage it. 7. First-aid training The basic first-aid knowledge is the common sense of astronauts, such as splinting the legs after a fracture and applying medicine to the wounds.

8. Land survival training simulates the accidental crash of the space shuttle in the wild in Russia. Trainees must receive basic survival training such as how to make a fire, how to build a temporary residence and how to ask for help. 9. In the event of an accident, astronauts should also be prepared to make an emergency landing in the Black Sea.

One of the exercises is that astronauts wear spacesuits and jump into the water. In the water, they should learn to inflate their own lifeboats. 1. weightlessness training in weightlessness, all daily tasks such as eating, drinking, going to the toilet, vomiting, etc. need to be relearned, otherwise it may bring you and others a lot of trouble.

Medical experts from NASA have specially developed a large-scale instrument called "Vomiting Comet Machine". An astronaut only needs to "live" in this instrument for 1 hours before going into space, so he will not vomit again after going into space. In this rotating machine, astronauts have to learn to wear spacesuits in 3 seconds.

11. Learn to fly the space shuttle. Any accident can happen. Therefore, if the automatic control system fails and causes an accident, or all other crew members are killed, someone must be able to fly the space shuttle back to Earth. 12. Money may be the most crucial point in the end. You should have at least $2 million.

1. On November 24th, 27, China's first lunar exploration satellite was successfully launched. The name of this satellite is Chang 'e-1. On November 24th, 27, the launch vehicle carrying China's first lunar exploration satellite was ignited and launched at Xichang Launch Center.

3. At present, there are three satellite launch bases in China, and the fourth launch base is about to be built in Wenchang, which is expected to be put into use in 21. On April 14th, 27, China successfully sent a Beidou satellite into space by the Changsanjia carrier rocket, which is a satellite in China's Beidou Plan. May I ask the main purpose of Beidou Plan is positioning and navigation?

5 to commemorate Galileo's feat of observing the starry sky with a telescope for the first time 4 years ago, in March 27, the International Astronomical Union (IAU) designated 29 as the International Year of Astronomy with the theme of "The Universe–Yours to Discover". 6. The following statement about planets is wrong. Jupiter was called Chang Gung in ancient China, and it has the largest mass among all planets in the solar system.

7. Up to now, humans have launched a large number of probes to explore other planets in the solar system. The following probes correspond to the detected planets correctly: Galileo Jupiter. 8. The following is about the solar system.