Named after the fastest Roman god, Mercury is the smallest and nearest of the planets to the Sun. Because this planet lies somewhat near to Earth, it can be seen in the late evening or early morning sky. It is also often called a morning star because it shines brightly in the early morning just before the sun rises. It has also been called an evening star for the same reason.
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Mercury travels so fast that it makes a complete loop in only 88 days. Because this planet is so small, it has a very weak magnetic field, causing gases, such as oxygen and hydrogen, coming out from the planet to quickly escape into space.
Gail's Science for Kindergarten Kids 