What is the closest star to the Earth? What is the circumference of the Earth?

The Earth has a history of 4.6 billion years. It originated from the original nebula of the solar system. After most of the matter in the original nebula formed the sun, the remaining matter formed most of the celestial bodies in the solar system, including the Earth. What is the closest star to the Earth? Encyclopedia Knowledge Network shares with you.

Contents of this article

1. The closest star to Earth

2. Circumference of the Earth

3. Is the space station synchronized with the Earth?

The closest star to Earth

The closest star to the Earth is the Sun. A star is a giant sphere of luminous plasma - mainly hydrogen, helium and trace amounts of heavier elements. The Sun is the star at the center of the solar system, accounting for 99.86% of the total mass of the solar system. The Sun is almost an ideal sphere of hot plasma and magnetic fields. Almost all the stars that can be seen at night are in the Milky Way.

The diameter of the sun is about 1.392×10⁶ kilometers, which is 109 times the diameter of the earth. Its volume is about 1.3 million times that of the earth, and its mass is about 2×10³⁰ kilograms.

The Sun is currently traveling through the Local Bubble region of the Orion Arm at the inner edge of the Milky Way. There are 50 nearest star systems within 17 light years of Earth.

Circumference of the Earth

The circumference of the Earth at the equator is 40,076 kilometers. The Earth is not a regular sphere, and the radius of the Earth's equator is slightly longer than the radius of the poles. The average radius is 6,371 kilometers, the surface area is about 510 million square kilometers, and the volume is about 108.32 billion square kilometers.

Among the eight planets in the solar system, the Earth ranks third in distance from the Sun from near to far, and is the only known celestial body with life in the universe.

The Earth has a history of 4.6 billion years and originated from the primordial nebula of the solar system. After most of the matter in the primordial nebula formed the sun, the remaining matter constituted most of the celestial bodies in the solar system, including the Earth.

The Earth's position in the solar system is very suitable, that is, it is not too close like Mercury and Venus, where the water and air are heated and separated, nor is it too far away like Jupiter and Saturn, where the water is frozen.

Is the space station in sync with the Earth?

Asynchronous. The orbit of the space station is 400-500 kilometers high, not a geosynchronous orbit, and the orbit of the space station is not above the equator. A space station, also known as a space station or a space station, is a manned spacecraft that operates in a low-Earth orbit for a long time and can accommodate multiple astronauts for visits, long-term work and life.

If the space station is synchronized with the earth, the synchronous orbit is less affected by the geomagnetic field than the low-Earth orbit, and the radiation it receives is stronger than the low-Earth orbit, which is not good for astronauts.

The Earth's surface area is 510 million square kilometers, of which 71% is ocean and 29% is land. From space, the Earth appears generally blue.

The interior of the earth can be divided into the core, mantle, and crust structure, and the external surface includes the hydrosphere, atmosphere, and magnetic field.