用英文来解释：Earth,Mars,galaxy

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/25 01:33:43

Earth
\x05The third planet from the sun,having a sidereal period of revolution about the sun of 365.26 days at a mean distance of approximately 149 million kilometers (92.96 million miles),an axial rotation period of 23 hours 56.07 minutes,an average radius of 6,378 kilometers (3,963 miles),and a mass of approximately 5.974 × 1024 kilograms (1.317 × 1025 pounds).
Mars
\x05The fourth planet from the sun,having a sidereal period of revolution about the sun of 687 days at a mean distance of 227.9 million kilometers (141.6 million miles) and a mean diameter of approximately 6,794 kilometers (4,222 miles).
Galaxy
\x05Any of numerous large-scale aggregates of stars,gas,and dust that constitute the universe,containing an average of 100 billion (1011) solar masses and ranging in diameter from 1,500 to 300,000 light-years.

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