How far is the Sun from Earth? How far away is the Sun from Earth?

The Earth's orbit around the Sun is a nearly circular ellipse, and the Sun is located at a focal point of the elliptical orbit, so that the distance between the Sun and the Earth is constantly changing over the course of a year or even a day. At the beginning of January every year, the Earth is at the perihelion of its orbit around the Sun, and the distance between the Sun and the Earth reaches a minimum value, which is about 100 million kilometers. At the beginning of July every year, the Earth is located at the aphelion point of its orbit around the Sun, and the distance between the Sun and the Earth reaches its maximum value, which is about 100 million kilometers.

The maximum distance between the Earth and the Sun is in kilometers, which is about the beginning of July, and the minimum distance is in kilometers, which is about the beginning of January. The average distance is kilometers. The distance between the Earth and the Sun is taken as an astronomical unit and rounded up to 150 million kilometers.

This distance is equivalent to 11,700 times the diameter of the Earth, it takes 17 years to reach the Sun by an airplane traveling at 1,000 kilometers per hour, and it takes more than 150 days to launch a spacecraft with kilometers per second, and it takes more than 8 minutes for the sun's rays to reach the Earth. The distance between the Sun and the Earth is called an "astronomical unit" in astronomy, and it is an important number, and many astronomical figures are based on it. There are several ways to measure the distance between the Sun and the Earth, one is to use the transit of Venus (that is, the Sun, Venus and the Earth are just in a straight line); Another way is to use asteroids to measure the distance between the sun and the Earth.

Historically, the distance from the Earth to the Sun was measured by the former method, and the average distance between the Sun and the Earth was calculated in this way, that is, a radar wave was emitted from the Earth, hit Venus, and then reflected back from Venus. The average distance between the Sun and the Earth measured using this method is 149,597,870 km, which is about 15,000 km.

The average distance between the Sun and the Earth is 100 million kilometers and is called an astronomical unit.

In a year, at the beginning of January, the Earth is at perihelion in its orbit, closest to the Sun, about 100 million kilometers; At the beginning of July, the Earth is at aphelion in its orbit, the farthest from the Sun, about 100 million kilometers. And on the same day, small changes in the distance between the Sun and Earth are negligible.

Distance from the Sun to Earth: 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.

Become the 7193rd fan.

The Sun is the closest star to Earth and is the central body of the solar system. The mass of the solar system is concentrated in the sun, and its strong gravitational pull controls the movement of celestial bodies such as large and small planets and comets.

It has given birth to the civilization of the earth and has always influenced the life of the earth. It is the only star whose surface structure can be studied in detail and is a huge astrophysics laboratory.

But the Sun is just an ordinary member of the 100 billion constant excitation missing omen stars in the Milky Way, located near the symmetry plane of the Milky Way, about 33,000 light-years from the center of the Milky Way and about 26 light-years north of the galactic plane, on the one hand, it rotates at a speed of 250 kilometers per second around the galactic center, and on the other hand, it moves at a speed of kilometers per second relative to the surrounding stars in the direction of Vega.

Extended Materials. The evolution of the sun.

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 of the Ming Lease, confirmed using computer models of stellar evolution and primordial nucleus, which 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 Sun's core every second, producing neutrinos 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 average distance of the Sun from the Earth is about 100 million kilometers, which can also be referred to simply as 1 astronomical unit (AU).