Glossary term: 火星
Description: 火星是太陽系中距太陽第四顆行星。它是一顆岩石組成的類地行星，半徑略低於 3400 千米，剛剛超過地球半徑的一半。火星上有非常稀薄的大氣層、大型峽谷系統和太陽系中最高的山：一座名為奧林匹斯山的死火山。科學家認為，火星早期曾有液態水。
它與太陽的典型距離約為 2.28 億千米或 1.52 個天文單位（地球-太陽距離）。它繞太陽一週需要 687 天。火星有兩顆小衛星：火衛一和火衛二。
它以羅馬戰神的名字命名。由於火星呈紅鏽色，因此常被稱為 "紅色行星"。多年來，科學家已向火星發送了許多登陸器，以研究火星的成分和大氣層。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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