Why is it getting a little cold?

The cold source of cold air actually comes from space.

Outer space without atmospheric protection is very cold.

The temperature is close to absolute zero -273 degrees,

The sun brings us light and heat radiation,

But the amount of thermal radiation is still amazing,

The atmosphere is like a quilt to protect the earth.

In this way, life on earth will not be destroyed by huge temperature difference.

Look at the moon first,

There is a thin atmosphere on the surface of the moon.

When the sun shines, the temperature is as high as 100 degrees.

When the sun is not shining,

The temperature plummeted to MINUS 100 degrees,

Without any protection, living things can't survive.

The intensity of solar radiation directly determines the temperature.

The closer you get to the equator, the hotter it gets.

The closer to the poles, the colder the weather.

Because the poles receive less sunlight.

When the earth is pulled by the moon,

The rotation produces an inclination angle,

The positive angle rays of the sun are not fixed on the equator,

This is a north-south S-shaped movement,

When the sun is in the tropic of cancer and the temperature in the northern hemisphere rises,

People in the northern hemisphere will feel warm and hot.

But the southern hemisphere will feel cool and cold,

When the sun is in the tropic of Capricorn,

People in the northern hemisphere will feel cold.