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What makes the sunshine and heat?

Looking at the star at night and the sun during the day, one could hardly believe it was the same type of celestial body....

What is the earth made of?

The most general answer to this question is probably: the earth is a ball made of almost stone. Please be clear: bluestone. Inside the...

Why is the temperature and temperature change in the Northern Hemisphere more variable than in the Southern Hemisphere?

Why is the temperature and temperature change in the Northern Hemisphere more variable than in the Southern Hemisphere? In one year, the Sun is shining...

What is a constellation?

Looking at the cloudless night sky, see stars sparkling; from one star, you draw a line or a curve to another star, some more...

Why is China the winter when the Earth is closest to the Sun?

We all have experienced: the closer we are to the furnace we feel hot, and it will get hotter and hotter; when we are...

What is the galaxy?

There is probably nothing more mysterious and surprising than "galaxies" (also known as the galaxy) in the sky. it is like a string of...

Why is spring and autumn in northern China so short?

The seasons are divided and called differently due to the cold, warm climate and long and short day and night changes. We all know...

Is the wind formed like?

Fluttering flags, sailboats running ice, the water swaying, the waves crashing all these things are caused by the wind. When the wind is gentle,...

The brightest star?

The star that you see the brightest in the sky is not the brightest. And the star you have just seen is dim, don't...

Why is the temperature difference between northern and southern China in winter than in summer?

In winter, the lowest temperature in northern China usually drops to -40 ~ 30 ° C, and everywhere in the field is covered with...

Why does the coastal area have sea breezes and continental winds?

People living in coastal areas have the experience: during the day, especially in the afternoon, when the hottest is usually wind from the sea,...

What is a shooting star?

Since thousands of years ago, seeing a meteor, people have wondered in amazement: what is it? Where is it from? and man has believed...
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What is color television?

The human eye sees an object and can see its colors because the light it emits, or light from its surface, bounces off, enters...

What is an audio CD?

Edison's phonograph underwent constant innovation to become a popular electric phonograph. It is made up of the motor, the turntable, the receiver, and the...

What is the principle of the fire detector?

Fire harms human lives and property, damages the ecological environment. Fire prevention is a matter of concern to all humans. If it is possible...

What is the principle of the theft alarm?

In important places such as money, gold, silver, underground record storage, etc., if a fraudster suddenly sneaks in. the burglar alarm will immediately sound...