How long does it take for an airplane to circle the earth? Why is there a layer close to the earth's surface?

The Earth is the largest terrestrial planet in the solar system in terms of diameter, mass and density. The Earth is also included in these eight planets. What is the layer closest to the Earth's surface? Which planet is the closest to the Earth? How long does it take for an airplane to circle the Earth? Please open the following content to swim in the ocean of knowledge!

Contents of this article

1. How long does it take for an airplane to circle the earth?

2. What is the layer close to the earth's surface?

3. Which planet is closest to the Earth?

How long does it take for an airplane to circle the earth?

It takes about 50 hours for an airplane to circle the earth. The length of the earth's equator is 40,000 kilometers. The length of the equator divided by the speed of the airplane equals the time it takes for the airplane to circle the earth. If the speed of the airplane is 800 kilometers per hour, then it takes 40,000/800=50 hours for the airplane to circle the earth.

The flying speeds of various aircraft are different, and the flying speed of civil airliners is 800km/h.

Aircraft are generally divided into civil aircraft, military aircraft and special-purpose aircraft. Civil aircraft are mainly used for civil transportation, and there are also some private aircraft.

The main advantages of airplanes are speed, convenience, ease, comfort, safety and reliability. In addition, airplanes also improve travel efficiency and alleviate traffic pressure.

What is the layer near the earth's surface?

The layer close to the Earth's surface is the troposphere. The troposphere is the layer of the Earth's atmosphere closest to the Earth's surface. It is also the densest layer in the Earth's atmosphere. It contains about 75% of the mass of the entire atmosphere, and almost all of the water vapor.

In fact, stars in the universe also have convection zones. In addition to radiation, the energy inside the sun also propagates outward through convection. The temperature outside the radiation zone drops very quickly, and the radiation loss on the surface of the sun increases, so the temperature difference between the upper and lower parts also increases, which will form a strong convection zone dominated by turbulence. However, the properties of this layer of gas vary greatly, so it is unstable.

The troposphere is the lowest layer of the atmosphere. It has the highest density and contains almost 75% of the mass of the atmosphere. Weather phenomena such as thunderstorms, dense fog, and wind shear occur in this layer. Most jet airliners fly over the top of this layer to avoid air currents that affect flight safety.

The troposphere stretches upward from the Earth's surface to the tropopause, which is the beginning of the stratosphere. In high-latitude areas, because the friction of the surface affects the airflow, a planetary boundary layer with an average thickness of two kilometers is formed. The formation of this layer depends mainly on the terrain, so it is separated from the rest of the troposphere by the inverse layer.

Which planet is closest to the Earth?

It is Venus. There are eight planets in the solar system that revolve around the sun, including the earth. As one of the eight planets, Venus is second only to Mercury in distance from the sun and is also the planet closest to the earth.

The eight planets are in the following order from the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Mars is considered to be the second most suitable planet for human habitation because its environment is very similar to that of the Earth in some aspects.