火星的大气层为什么会如此稀薄？
Why is Mars's atmosphere so thin?
火星质量小、引力弱，早期大气中的气体逐渐被太阳风剥离；同时它缺乏全球性磁场，无法像地球那样屏蔽太阳风。内部冷却也使火山和板块活动停止，不再补充气体。多重因素叠加让火星从较厚大气退化成今天稀薄的二氧化碳大气。
Mars is small and weakly gravitational, so much of its early atmosphere was stripped by the solar wind; lacking a global magnetic field, it could not shield itself like Earth. Its interior also cooled, ending volcanism that might replenish gas. Together these left Mars with only a thin carbon-dioxide atmosphere.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#火星 #大气逃逸 #磁场
去火星单程要多久，为什么很难随时出发？
How long is a one-way Mars trip, and why can't we launch anytime?
最近距离单程约7个月；由于地球和火星轨道位置，发射窗口每约26个月才出现一次。
A one-way trip is ~7 months at closest approach; launch windows open only about every 26 months due to orbital positions.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#发射窗口 #行星轨道
有哪些证据表明火星曾经有水？
What evidence shows Mars once had water?
火星表面有大量干涸的河床、三角洲和只有流水才能形成的圆形卵石，探测器还在地下发现了水冰。矿物如赤铁矿和黏土也需要在有水环境中生成。这些都说明火星过去比现在温暖湿润。
Mars shows dried-up river channels, deltas and rounded pebbles that only form in flowing water, and probes have found water ice underground. Minerals like hematite and clay also need water to form. Together they show Mars was once warmer and wetter than today.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#火星 #水 #探测器
人类为什么想去火星建立基地？
Why do people want to build a base on Mars?
火星环境比别处更接近地球，研究它有助于了解行星演化，也可能在未来成为人类的“第二家园”。
Mars is more Earth-like than other worlds; studying it informs planetary evolution and could make it a future 'second home'.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#火星殖民 #探索
科学家如何证明火星上曾经存在过水？
How do scientists know Mars once had water?
通过轨道器和巡视器拍摄的干涸河床、三角洲、沉积岩层，以及探测器直接测到地下水冰和富含黏土矿物的岩石，都是古代液态水存在的证据。
Orbiters and rovers have found dried riverbeds, deltas, sedimentary layers, plus direct detection of subsurface water ice and clay minerals—all evidence that liquid water flowed on ancient Mars.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Carr M. H., The Surface of Mars, Cambridge University Press, 2006
Michael H. Carr, The Surface of Mars, Cambridge University Press, 2006
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL2929281W：The surface of Mars（首版
#火星 #水 #地貌
火星的全球性沙尘暴能大到什么程度？
How large can Mars's planet-wide dust storms become?
火星有时爆发席卷全球的沙尘暴，可遮住整个星球表面数周甚至数月，使阳光难以到达地面，曾影响探测器的供电。
Mars occasionally develops global dust storms that can blanket the entire planet for weeks or months, blocking sunlight from the surface and once crippling a lander's power supply.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#火星 #沙尘暴 #气候
火星曾经可能有液态水，为什么现在大气这么稀薄？
Mars may once have had liquid water; why is its atmosphere so thin today?
火星质量小、引力弱，加上早期核心冷却使全球磁场消失，太阳风长期剥离大气，导致气压极低、液态水难以稳定存在。
Mars is small and weakly gravity-bound; once its core cooled and its global magnetic field vanished, the solar wind steadily stripped away the atmosphere, leaving a very low pressure where liquid water cannot persist.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#火星 #大气 #磁场
太阳系最高的山在哪颗行星上？有多高？
On which planet is the tallest mountain in the solar system, and how high is it?
火星上的奥林帕斯山是太阳系最高的火山，高约 22 公里，约为珠穆朗玛峰的近三倍。
Olympus Mons on Mars is the tallest volcano in the solar system, rising about 22 km—nearly three times the height of Mount Everest.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#火星 #火山 #地形
火星为什么看起来是红色的？
Why does Mars look red?
火星表面富含氧化铁，也就是我们熟悉的铁锈，使土壤和岩石呈现红橙色。风把红橙色的尘埃吹遍全球，连天空都泛着淡淡的红色。这一特征让火星被称为『红色星球』。
Mars is rich in iron oxide, the familiar rust that gives its soil and rocks a red-orange color. Winds spread this dust across the whole planet, even tinting the sky a pale red. This is why Mars is called the 'Red Planet'.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#火星 #氧化铁 #沙尘
火星上的奥林匹斯山有什么特别之处？
What is special about Olympus Mons on Mars?
奥林匹斯山是火星上的盾状火山，高度约22公里，是地球珠穆朗玛峰的两倍多。它的底座直径超过600公里，是太阳系已知最高的火山。火星低重力和缺乏板块运动，使这样巨大的火山得以缓慢堆积形成。
Olympus Mons is a shield volcano on Mars about 22 kilometers high, more than twice the height of Mount Everest. Its base spans over 600 kilometers, making it the tallest known volcano in the solar system. Mars's low gravity and lack of plate tectonics let such a giant build up slowly.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#火星 #火山 #奥林匹斯山
火星有几颗卫星？它们有什么特点？
How many moons does Mars have, and what are they like?
火星有两颗小卫星，火卫一和火卫二，外形都很不规则，像被引力捕获的小行星。火卫一较大且离火星很近，正以每年约2厘米的速度缓慢螺旋下落。它们都很小，表面布满撞击坑。
Mars has two small, irregularly shaped moons, Phobos and Deimos, looking like captured asteroids. Phobos is the larger and orbits so close that it is slowly spiraling inward by about 2 centimeters per year. Both are tiny and heavily cratered.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#火星 #卫星 #火卫一
火星的两颗小卫星叫什么？它们形状为何不规则？
What are Mars's two small moons called, and why are they irregularly shaped?
火卫一（Phobos）和火卫二（Deimos）都很小，自身引力不足以把自己拉成球形，因此呈现土豆状的不规则形态，可能源自小行星被俘获。
Phobos and Deimos are small, with gravity too weak to pull them into spheres, so they look like lumpy potatoes; they may be captured asteroids.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carl Sagan,《Cosmos》Random House,1980;中译《宇宙》
C. Sagan, Cosmos, Random House, 1980; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9780394502946（按标识回读: Cosmos）
#火星 #卫星 #小行星