More about Mercury!Did
you know Mercury is also called a morning star because it shines
brightly in the early morning? It's true, it's also known as the
evening star because of the exact same reason! Mercury is covered with
craters which were created by asteroids and comets crashing into
Mercury by accident. Unlike other planets, Mercury has no atmosphere.
This is because it is too small and it doesn't have enough gravity to
hold down an atmosphere around it. The sun is also another reason why
Mercury does not have an atmosphere because it is so close to the Sun
any atmosphere gets blown away by the Sun's solar winds! Sounds intense
doesn't it?! 
