安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- Mercury - Science@NASA
Mercury is the closest planet to the Sun, and the smallest planet in our solar system - only slightly larger than Earth's Moon
- Mercury | Facts, Color, Size, Symbol | Britannica
Mercury, the innermost planet of the solar system and the eighth in size and mass Its closeness to the Sun and its smallness make it the most elusive of the planets visible to the unaided eye Because its rising or setting is always within about two hours of the Sun’s, it is never observable when the sky is fully dark
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