What is the diameter of the sun 5 and what is the diameter of the sun

The power of the scientific method – can you measure the diameter of the sun with a ruler.

Qin Pu is selected from "Do You Want to Be an Amateur Scientist" (Shanghai Education Press).

What is the diameter of the sun, can you count.

Don't think it's a ridiculous question, as long as we understand some of the principles of aperture imaging.

At about 9 a.m. or 3 p.m. on a sunny day, use a thick piece of cardboard with a small hole to cover the sunlight shining on the window, let the image of the sun be displayed on a piece of white paper (the paper and the sunlight should be perpendicular), measure the diameter of the circular spot d with a ruler, and then measure the distance from the image to the small hole l, and then calculate according to the following formula, the diameter of the sun d: can be obtained

d = s·d l (s is the average distance from the sun to the earth, and its value is meters).

When measuring the distance from the small hole to the image, you can press one end of a wire on the edge of the small hole, pull the other end to the image, and then measure the length of this piece of rope; To measure the diameter of an image, use a thin pencil on both sides of the image to draw two parallel lines, and then carefully measure the distance between the two lines.

Modern science has determined that the radius of the Sun is meters. If you do it carefully, you will come up with a value with an error of less than 1%.

It can be seen that ordinary people can also measure the diameter of the sun on the earth as long as they master the scientific method.

In the same way, how do people know the weight of the sun, how do people know that thermonuclear reactions are going on inside the sun, how do people know the surface temperature and the internal temperature of the sun, how do people know the age and lifespan of the sun, ......All this is unimaginable without the scientific method.

This material can be used for:"Scientific theories have a scientific method"teaching, stimulating students' interest and understanding of the scientific method).

It is about 1392020 km (109 times the diameter of the Earth).

The diameter of the Sun is about 1,392,000 (km.

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.

As a star, the Sun, its overall appearance is 38.3 billion trillion trillion watts of luminosity and an absolute magnitude. It is a yellow G2 dwarf star with an effective temperature equal to 5800 degrees Kelvin. The average distance between the Sun and the Earth orbiting it is 149597870 kilometers (light seconds or 1 astronomical unit).

By mass, its material composition is 71% hydrogen, 26% helium and a small amount of heavier elements. They both release energy through nuclear fusion, and according to the theory, the last nuclear fusion reaction of the sun produced substances such as metals such as iron and copper.

The diameter of the Sun is kilometers.

The Sun is located in the solar system.

The star in the center, which is almost an ideal sphere of hot plasma intertwined with 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; The mass is about 2 10 kilograms (330,000 times that of the Earth).

Location. The Sun is just a very ordinary star in the universe, but it is the central object of the solar system. In the solar system, there are eight planets, including our Earth.

Some dwarf planets.

Comets and countless other small bodies of the solar system orbit the Sun under the strong gravitational pull of the Sun. The territory of the solar system is huge, with Pluto alone.

For example, its orbit is nearly 40 astronomical units away from the sun, that is, 6 billion kilometers, and in fact, the range of the solar system is dozens of times that of the whole shot.

The diameter of the Sun is 1,392,000 kilometers, which is 109 times the diameter of the Earth, the volume is about 1.3 million times that of the Earth, and its mass is about 330,000 times that of the Earth.

In terms of chemical composition, about three-quarters of the sun's mass is hydrogen, and almost all of the rest is helium, including less than 2% mass of oxygen, carbon, neon, iron and other heavy elements, which are used to release light and heat into space in the pure way of nuclear fusion.

The sun and age.

The Sun was formed about 100 million years ago in a cloud of collapsed hydrogen molecules. The time of the formation of the Sun is measured in two ways: the current age of the Sun in the main sequence zone, confirmed using computer models of stellar evolution and primordial nucleosynthesis, is about 100 million years.

This is very consistent with the radioactive dating of the oldest material of the sun is 100 million years old.

The Sun has reached middle age in the evolutionary phase of its main sequence, in which nuclear fusion is the fusion of hydrogen into helium at the core. More than 4 million tons of matter are converted into energy in the core of the sun every second, producing medium and micro particles and solar radiation. At this rate, the Sun has so far converted about 100 Earth-masses of matter into energy, and the total time spent by the Sun in the main sequence is about 10 billion years.

The diameter of the Sun is 1,392,000 km. The sun occupies an absolute dominant position in the solar system, is an invincible hegemon-like existence, scientists statistically calculate that in the solar system of all visible matter, the mass of the sun accounts for the total mass of the entire solar system, that is to say, Zhengyin divides all the material in the vast solar system into 10,000 parts, the sun itself accounts for 9986 parts, and the other large number of planets, moons, comets, asteroids, etc. can only be divided into the remaining 14 parts. The mass of the Sun is times the mass of other visible matter in the solar system.

Introduction: 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, the small planets, meteors, comets, outer Neptune objects, and interstellar dust all revolve around the Sun, and the Sun revolves around the center of the Milky Way.

The Sun is an ordinary star in the Milky Way, with an average distance of 149.6 million kilometers from the Earth, a diameter of 1.39 million kilometers, an average density of grams of cubic centimeters, a mass of grams, a surface temperature of about 6,000 Ke, and a central temperature of 15 million Ke.

The Sun is an ordinary star in the Milky Way, with a diameter of 1.39 million kilometers.

The average distance between the sun and the earth is 149.6 million kilometers, the average density is grams of cubic centimeters, the mass is grams, the surface temperature is about 6,000 k, and the core temperature is 15 million knew. From the inside to the outside, they are the solar nuclear reaction zone, the solar troposphere, and the solar atmosphere. Thermonuclear reactions are constantly taking place in its central region, and the energy produced is radiated into space.

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

The structure of the sun.

According to the existing theories of star formation and structure, the structure of the sun is mainly divided into thermonuclear reaction zones from the inside out, with the radiation layer outside the core, the troposphere outside the radiation layer, and the solar atmosphere outside the troposphere.

The troposphere is located outside the radiant layer, and the pure Xun is about 75% radius to the surface of the sun, the temperature is about 500,000 degrees Celsius, and the density is reduced to 150 kilograms per cubic meter. Here, due to the huge temperature difference, the plasma convection phenomenon of the sun is caused, and the heat inside the sun is transferred to the surface of the sun in the convection zone in the form of convection. <>