The earth is the only planet except Pluto that can see a total solar eclipse.It is a coincidence that we can see the total solar eclipse:the moon,which is 400 times smaller than the sun

The solar system and the celestial body system that takes the sun as the center and is dominated by its gravity and moves around it are called the solar system

The Milky way is a giant spiral galaxy,Sb type,with a total of four spiral arms.It contains 100 billion or 200 billion stars.The sun is about 20000 to 30000 light-years

Scientists believe it originated from an incredible big bang 13.7 billion years ago.This is an unimaginable energy explosion.It will take 12 billion to 15 billion years for light from the edge of the universe to reach the earth

In the vast universe,the existence of each celestial body is special,or can be said to be unique.Every celestial body has its own characteristics

How to define the concept of planet has always been a controversial issue in astronomy.The general assembly of the International Astronomical Union adopted a new definition of"planet"on

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