What does the sun do and what is the role of the sun?

Photosynthesis in plants requires the ......... of sunlight

Without the sun, there would be no daylight on Earth. The temperature will be super cold, and all life will die in an instant, with unimaginable consequences.

In short, without the sun, human beings cannot live, and the earth is a dead planet

Give us energy, or where will my food come from? First of all, plants convert light energy into their own energy through photosynthesis, and then it is eaten by animals and converted into their own energy!

The Sun is the largest object in the solar system. It has the entire mass of the solar system (Jupiter has most of the remaining mass).

The sun is personified in many myths: the ancient Greeks called it helios, while the ancient Romans called it sol.

The mass of the Sun is composed of 75% hydrogen and 25% helium (the atomic number is hydrogen, which is helium); Other substances ("Metals") is only the sum of the totals. In the core of the Sun, hydrogen is converted to helium, and these amounts change slowly.

The outer layers of the Sun have different rotation periods: the equatorial plane rotates once in the sky; In the polar regions, it reached 36 days. This peculiar phenomenon arises because the Sun is not a solid sphere like Earth, and a similar situation can be seen on gaseous planets.

Therefore, in the interior of the Sun, the rotation period is also different, but the core of the Sun still rotates like a solid body.

The state of the Sun's inner core is staggering, with a temperature of 15,600,000 Keliton and a pressure equivalent to 250 billion atmospheres. The gas in the inner core is so compressed that it is 150 times denser than water.

The Sun releases energy in erg seconds (i.e. 3,860 billion trillion megawatts), which is produced by nuclear fusion reactions. Approximately 700,000,000 tons of hydrogen atoms are converted into approximately 695,000,000 tons of helium atoms per second and 5,000,000 tons (erg) of energy in the form of gamma rays. Because the rays are emitted to the surface of the sphere, the energy is constantly absorbed and dissipated, so that the temperature is constantly lowered, so there is a huge temperature difference between the inside and outside and the basic visible light.

The energy output by convection is at least 20% higher than the energy diverged by radiation.

The outer surface of the Sun is called a photosphere and has a temperature of about 5,800 kilo. Sunspots belong to the "cooler" part of the sun, at only 3800 kai (they look darker because of the comparison to the surrounding area). Sunspots can be very large, up to 50,000 kilometers in diameter.

Sunspots arise as a result of complex and currently unknown interactions from the Sun's magnetic region.

The vast majority of the energy on Earth comes from the sun.

The sun plays the role of a bright light, and you can't live without it.

1. The sun is the origin of human life; The origin of life requires energy, and life also needs energy to sustain and continue. Certain temperature conditions are also necessary for the survival and continuation of organisms, and at a minimum, water must remain in a liquid state. The sun brings us warmth and light, providing us with the necessary energy.

Sunlight can give people heat, improve blood circulation, promote the normal secretion of sweat and sebum, sunlight can kill bacteria, so that the surface of the human body maintains a normal bacterial flora. Photosynthetic organisms are the basis of the food chain. The Earth's energy is directly or indirectly supplied by sunlight.

2. Many geological and meteorological disasters on the earth are related to solar activity. Such as solar wind, sunspots, flares, etc.

3. Nowadays, through scientific and technological equipment, people have expanded the direct or indirect use of solar energy, the simplest is solar water heaters, and then solar power generation, using solar energy to drive vehicles.

In life, a lot of things are related to the sun. With the sun, the flowers, trees, and crops on the earth can take root, sprout, grow leaves, blossom, and bear fruit; With the sun, birds, insects, beasts, and fish can survive and reproduce. If there were no sun, there would be no plants and animals on Earth.

The sun is the central body of the solar system and occupies the overall mass of the solar system. The eight planets in the solar system, asteroids, meteors, comets, outer Neptune objects, and interstellar dust all revolve around the Sun, which revolves around the center of the Milky Way.

The Sun is a star located at the center of the solar system, and it is almost an ideal sphere intertwined with hot plasma and magnetic fields. The diameter of the Sun is about 1,392,000 (kilometers, equivalent to 109 times the diameter of the Earth; It is about 1.3 million times the size of the Earth; Its mass is about 2 10 kilograms (330,000 times that of the Earth). In terms of chemical composition, about three-quarters of the mass of the Sun is now hydrogen, and almost all of the rest is helium, including oxygen, carbon, neon, iron, and other heavy elements with less than 2% of the mass, which uses nuclear fusion to release light and heat into space.

1) Influence on the geographical environment Solar radiation directly provides light and heat resources for the earth, and the growth and development of organisms on the earth are inseparable from the sun. Solar radiation maintains the surface temperature and is the main driving force for the movement of water, atmosphere and biological activities on Earth. Solar radiation is the main energy of external forces in geological processes, and various external forces work together to change the surface morphology.

The decreasing law of solar radiation from low latitude to high latitude forms one of the laws in the distribution of natural zones: that is, the law of zonal differentiation. (2) Impact on human production and life Fossil fuels such as coal, oil, and natural gas, which are the main energy sources for industrial production, are solar energy accumulated after biological fixation in geological history.

Solar radiation energy is the main energy of solar cookers, solar water heaters, and solar power stations used in our daily life and production. Most of the water energy used in hydroelectric power stations is converted from solar energy; Bioenergy, which is inseparable from human daily life, is also converted from solar energy. Greenhouse agriculture is developed in order to make full use of the sun's light and heat resources.

2. The impact of solar activity on the ground: the place where the earth's surface depends for survival and development. As the Earth in the solar system, it has been affected by sunlight and heat throughout its history, and their interaction with various phenomena caused by the Earth's internal dynamics has driven the evolution of the Earth's surface. After the formation of the earth's atmosphere and river hydrosphere, the solar engine, which is powered by solar energy, drives the atmosphere and ocean circulation, forming wind, clouds, rain and snow.

Rivers appeared, began to flow into the oceans, and mountains were eroded. All of this is shaping and changing the Earth's environment, affecting the Earth's biosphere and diversifying the Earth's climate, biology and geochemical cycles. When the activity of the sun is enhanced, the huge energy of the sun is suddenly released, and particles of different energies are ejected at the same time, which rapidly enhances the electromagnetic radiation of various wavelengths, and causes magnetic storms and auroras, disturbs the atmospheric ionosphere, and disturbs the state of near-earth space.

When a large flare erupts, the density of particle streams near Earth's orbit exceeds 10 times usual, causing damage to artificial satellites, spacecraft and the instruments and equipment in them, and seriously threatening the health and safety of astronauts. Enhanced X-rays can disrupt the normal state of the ionosphere, resulting in signal attenuation or even disruption. Magnetic storms and ionospheric storms are caused by large numbers of charged particles before they reach the Earth, which seriously affect radio communications, space communications between the ground and satellites or spacecraft, and aviation and navigation communications.

1. Provide heat.

2. Provide gravitational attraction.

3. Provide mythological materials.

4. Provide scientific research objects.

5. Provide light.

1. Bring us light and heat.

2. It will not produce exhaust gas, and can be ...... with solar energy, solar cars, and solar watchesThese save electricity, water, and the environment.

3. Sunlight shining on the ** will dilate the subcutaneous blood vessels, increase the blood flow, increase the excretion and resistance of toxic substances, increase the secretion of saliva and gastric juice, strengthen gastrointestinal peristalsis, and promote appetite and digestion.

4. **It can also produce vitamin D from some chemicals, such as ergosol, cholesterol, etc., under the exposure of sunlight. These vitamins, calcium and phosphorus, are important components of our bones, and without them, you can get hypochondriasis.