What is the closest planet to the sun?
The Solar System is heliocentric, meaning that the sun is at the center. Various planets, like Earth, orbit the sun. This massive star is made up primarily of hydrogen and helium; it's billions of years old.
Answer and Explanation:
Mercury is the closest planet to the sun. A year on Mercury will take around 88 Earth days, while a day will take around 59 Earth days. This planet is...
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from CLEP Natural Sciences: Study Guide & Test PrepChapter 9 / Lesson 12