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

Average orbital radius: 149,600,000 km (astronomical units from the Sun) Since the Earth's orbit around the Sun is an elliptical and the Sun is at a focal point, this distance varies. Its maximum is 152.1 million km (the Earth is at aphelion); The minimum is 147.1 million km (the Earth is at perihelion); The average is about 149.6 million kilometres; This distance is defined as an astronomical unit, and in 1976 the International Astronomical Union established it as 149597870 km, and has been used since 1984.

At this distance, it takes 8 minutes and 18 seconds for sunlight to reach the Earth's surface.

Planet diameter: 12, km Mass: kg Equatorial gravity (Earth = 1) Escape velocity (km seconds) Rotation period (days) Number of satellites:

1 Revolution period (days) Yellow and red intersection angle (degrees) Albedo Rotation direction: west to east.

The distance between the earth and the sun is about 100 million kilometers, for example, a person has to walk day and night for 3,000 years to get there.

149.6 million kilometers, or one astronomical unit.

149.62 million kilometers, which is about 100 million kilometers, which is what astronomy calls an astronomical unit, theoretically the fastest vehicle of mankind can fly to the sun in 22 months.

The Earth is 100 million kilometers from the Sun. Since the Earth's orbit is an ellipse, this is only an average, and at the nearest place, the Earth is 147 million kilometers from the Sun, and the farthest distance is 152 million kilometers.

From Earth, the celestial bodies in the sky are measured at 15° per hour, which is 15 degrees per minute'angular velocity.

Moving westward (satellites and atmospheres in low orbit.

except for meteors). Objects close to the celestial equator move as far as the Moon as seen from the Earth's surface every two minutes.

or the apparent diameter of the sun (both are almost identical).

Formation of the Earth:

History of the Earth. Very long. According to the measurements of radiocarbon dating, the solar system.

It was formed about 6.5 billion years ago, while the native Earth was formed about 6.5 billion years ago.

Theoretically, the formation of the Sun began with the gravitational collapse of a huge cloud of hydrogen molecules 6.5 billion years ago, and most of the collapsed masses were concentrated in the center, forming the Sun; The rest of the part rotated and flattened to form a protoplanetary disk, which in turn formed planets, moons, asteroids, and comets.

Meteoroids and other small bodies of the solar system.

The nebula hypothesis asserts that the microplanets that form the Earth originate from the massaching masses of gas, ice particles, and dust with a diameter of 1 to 10 kilometers that are left over from accretion and collapse. These materials grew over 10 million to 20 million years to form the native Earth. The nascent Earth's surface is an "ocean" of magma.

The Earth is 100 million kilometers from the Sun. The farthest point of the Earth from the Sun is 152,097 kilometers, and the closest time of the Earth to the Sun is 147,098 kilometers, which is about 100 million kilometers if averaged.

The Earth is the third closest planet to the Sun in terms of distance from the Sun, and it is also the terrestrial planet with the largest diameter, mass and density in the solar system, at a distance of 100 million kilometers from the Sun. The Sun is currently passing through the local interstellar cloud in the local bubble of the Orion Arm at the inner edge of the Milky Way. At a distance of 17 light-years from Earth, there are 50 of the closest galaxies.

The distance between the Earth and the Sun directly determines the biodiversity of various species on the Earth, as well as the stable cycle of ecosystems. If the distance between the Earth and the Sun changes, the entire history of the Earth will be rewritten.

Mass volume. The Sun is a huge, red-hot planet of gas. Knowing the distance between the Sun and the Earth, and then measuring the diameter of the angle of view of the sun's circle from the earth, we can find that the radius of the sun is 10,000 kilometers, which is 109 times the radius of the earth.

From this, it can be calculated that the volume of the Sun is 1.3 million times that of the Earth.

According to Kepler's third law of planetary motion, astronomers can also calculate that the mass of the Sun is kilograms, which is 330,000 times that of the Earth, using the mass of the Earth and the radius and period of its orbit around the Sun. And concentrates the mass of the solar system. However, even such a behemoth, in the vast universe, is just an ordinary star of medium mass.

The Sun is about 100 million kilometers away from the Earth. If it is converted to the speed of light, it is about the fraction of light, and if it is forcibly converted into light years, it will be about light years.

We orbit the Sun at a distance of about 150 million kilometers, in fact, since our orbit is an ellipse, this is only an average. At its closest point, the Earth is 147 million kilometers from the Sun, and its farthest distance is 152 million kilometers.

Solar Evolution:

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

This is very consistent with the fact that 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 tonnes of matter are converted into energy at the core of the sun 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.