Earth's neighboring planet: Mercury
Mercury, the closest planet to Earth, is also closest to the Sun.  It has a tremendous temperature, is the smallest planet in the universe and can be seen with the naked eye from Earth.  Mercury appearing in the early morning and evening sky changes art like the moon.
Being close to the sun, its orbit is also small.  It completes one orbit of the sun in our 7 days.  And one of our 115 days orbits.  That is, one day of Mercury is our 115 days.  As long as.
Mercury is 4 kilometers in diameter, with moon-like mounds on its surface.  There is no air on Mercury so its surface seems to wear out.  Its surface is thin and composed of rocks, its shape does not change.  But sometimes there are flat plains.  Mercury does not have an atmosphere, so its temperature changes instantly from extreme heat to extreme cold. Even on Mercury, the sky looks dark during the day.
 
   
   
   
 
 
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