Glossary term: 火星
Description: 火星是太阳系中距太阳第四颗行星。它是一颗岩石组成的类地行星，半径略低于 3400 千米，刚刚超过地球半径的一半。火星上有非常稀薄的大气层、大型峡谷系统和太阳系中最高的山：一座名为奥林匹斯山的死火山。科学家认为，火星早期曾有液态水。
它与太阳的典型距离约为 2.28 亿千米或 1.52 个天文单位（地球-太阳距离）。它绕太阳一周需要 687 天。火星有两颗小卫星：火卫一和火卫二。
它以罗马战神的名字命名。由于火星呈红锈色，因此常被称为 "红色行星"。多年来，科学家已向火星发送了许多登陆器，以研究火星的成分和大气层。
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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
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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