载人航天生命保障系统要提供什么？
What must a crewed spacecraft life-support system provide?
它要持续供给氧气、去除二氧化碳、循环与净化水、调节温湿度并处理废物；先进系统追求闭环再生以减少地面补给。
It must supply oxygen, remove CO2, recycle and purify water, control temperature and humidity, and process waste; advanced systems aim for closed-loop regeneration to cut resupply.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Perry, Sargusingh, Toomarian,《Guiding Requirements for Designing Life Support System Architectures for Crewed Exploration Missions Beyond Low-Earth Orbit》, AIAA SPACE 2016, 2016 (DOI: 10.2514/6.2016-5461)
Perry, Sargusingh, Toomarian, 'Guiding Requirements for Designing Life Support System Architectures for Crewed Exploration Missions Beyond Low-Earth Orbit', AIAA SPACE 2016, 2016, DOI: 10.2514/6.2016-5461
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.2514/6.2016-5461：Guiding Requirements for
#航天 #生命保障
空间站里的水和空气是怎么循环再利用的？
How do space stations recycle water and air?
汗液和尿液被再生为饮用水，电解水供氧，二氧化碳经萨巴蒂尔反应还原成水和甲烷，闭环率高、补给少。
Sweat and urine are recycled into drinking water; electrolysis makes oxygen; CO2 is reduced via the Sabatier reaction back into water and methane. The loop is highly closed, cutting resupply.
难度 入门 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#航天工程 #中国航天
中国天眼FAST为什么偏偏建在贵州的喀斯特洼地里？
Why is China's FAST telescope placed in a karst depression in Guizhou?
天然漏斗形洼地省去大量挖填土方，喀斯特透水减少积水，且当地偏远电磁环境宁静，利于接收微弱信号。
The natural funnel shape saves huge earthworks, karst drains well to avoid pooling, and the remote area is radio-quiet—ideal for faint signals.
难度 入门 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Nan 等《中国科学》2006 / 国家天文台（NAOC）
Nan et al., Science in China (2006); National Astronomical Observatories (NAOC)
#航天工程 #中国航天
空间站巨大的太阳能板为什么能一直追着太阳转？
Why do the station's huge solar arrays keep tracking the Sun?
它们用双轴驱动持续调整朝向，因为轨道每约90分钟绕地球一圈，只有跟踪才能最大化发电。
They use two-axis drives to keep facing the Sun, since the station orbits Earth about every 90 minutes—only tracking maximizes power.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《十万个为什么》第六版航空与航天分册,少年儿童出版社,2013
Ten Thousand Whys: Aviation and Aerospace volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#航天工程 #中国航天
为什么空间站能一直绕着地球转？
Why does the space station keep orbiting Earth?
空间站在很高很高的天上，以很快的速度往前冲。地球的引力把它拉弯成圆圈，它就一直绕着地球跑。
The space station is very high up and races forward fast. Earth's gravity bends its path into a circle, so it keeps looping around our planet.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Curtis，《轨道力学》（第4版）
Curtis, 'Orbital Mechanics for Engineering Students' (4th ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787030253231（豆瓣书目条目: 轨道力学）
#空间站 #地球 #绕圈
空间站为什么要靠一次次'对接'在天上拼起来？
Why is the space station assembled in orbit by docking?
单发质量超过火箭运力，所以把模块分别送上天后在轨对接拼装，既灵活又能随时扩展。
A single launch exceeds rocket capacity, so modules are sent up separately and docked in orbit—flexible and extensible.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#航天工程 #中国航天
为什么地热发电站能从地下取电？
Why can a geothermal plant make electricity from underground?
地下很深处有滚烫的岩石把水烧热成蒸汽。蒸汽推动涡轮机转动发电机，就发出电来了。
Deep underground, hot rock turns water into steam. That steam spins a turbine connected to a generator, producing electricity.
难度 入门 · 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
David Macaulay,《The Way Things Work》,Houghton Mifflin,1988;中译《万物运转的秘密》
D. Macaulay, The Way Things Work, Houghton Mifflin, 1988; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL15130328W：The Way Things Work（按标
#地热 #蒸汽 #发电
FAST那口大'锅'为什么能变形？
Why can FAST's giant dish change its shape?
它由数千块带促动器的小面板组成主动反射面，可实时微调成抛物面，把不同天区的电磁波聚焦到馈源。
Its active surface has thousands of small panels driven by actuators that retune into a paraboloid in real time, focusing signals from different parts of the sky onto the feed.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#航天工程 #中国航天
为什么火箭要一节一节地扔掉？
Why do rockets drop off in separate stages?
火箭越往上飞越轻，把烧完的空燃料箱扔掉能省力气。每扔一节，剩下的部分就更轻，更容易冲出大气层。
As a rocket climbs it gets lighter, and dropping empty fuel tanks saves effort. Each stage let go makes the rest lighter, helping it break through the atmosphere.
难度 入门 · 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
Sutton & Biblarz,《Rocket Propulsion Elements》第9版,Wiley,2016
G. P. Sutton and O. Biblarz, Rocket Propulsion Elements, 9th ed., Wiley, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9780665590955 (2002)
#火箭 #分级 #推力
航天员出舱为什么必须穿厚重的航天服，而不能穿普通衣服？
Why must astronauts wear bulky suits outside, not normal clothes?
舱外是真空、温差可达±150℃、还有辐射和微流星，航天服要加压供氧、隔热并防撞，等于一艘微型飞船。
Outside is vacuum with ±150°C swings plus radiation and micrometeoroids; the suit must pressurize, supply oxygen, insulate and shield—it is a tiny spacecraft.
难度 入门 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#航天工程 #中国航天
为什么探测飞船要借着行星的引力加速？
Why do space probes borrow a planet's gravity to speed up?
探测器飞近大行星时，会被它的引力拉一把并拐个弯。借力后速度更快，能省下很多燃料飞向更远的星球。
As a probe swings past a big planet, the planet's gravity tugs and bends its path. The boost speeds it up, saving huge amounts of fuel for farther worlds.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Curtis，《轨道力学》（第4版）
Curtis, 'Orbital Mechanics for Engineering Students' (4th ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787030253231（豆瓣书目条目: 轨道力学）
#探测飞船 #引力 #加速
为什么大风车能发电？
Why can a wind turbine make electricity?
风吹动叶片转动连着的发电机。发电机把转动的力气变成电，送到家里用。
Wind turns the blades, which spin a generator inside. The generator changes that spinning motion into electricity for our homes.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
David Macaulay,《The Way Things Work》,Houghton Mifflin,1988;中译《万物运转的秘密》
D. Macaulay, The Way Things Work, Houghton Mifflin, 1988; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL15130328W：The Way Things Work（按标
#风车 #发电机 #电
为什么卫星不会掉下来？
Why don't satellites fall down?
卫星飞得又快又高，地球的拉力让它转弯绕着地球跑。它一直往前冲又一直被拉弯，就停在天上转圈。
A satellite flies very fast and high. Earth's pull bends its path into a circle, so it keeps racing forward while falling around the Earth.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Curtis，《轨道力学》（第4版）
Curtis, 'Orbital Mechanics for Engineering Students' (4th ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787030253231（豆瓣书目条目: 轨道力学）
#卫星 #地球 #绕圈
为什么火箭能冲上天空？
Why can a rocket shoot up into the sky?
火箭尾巴喷出滚烫的气体，气体往下冲。用力往下的同时，火箭就被推着往上飞。
A rocket blasts hot gas out of its tail, pushing downward. As the gas goes down hard, the rocket is pushed up into the sky.
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
Sutton & Biblarz,《Rocket Propulsion Elements》第9版,Wiley,2016
G. P. Sutton and O. Biblarz, Rocket Propulsion Elements, 9th ed., Wiley, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9780665590955 (2002)
#火箭 #气体 #推力
中国空间站'天宫'为什么选在约400公里的高度？
Why is the Tiangong space station at about 400 km altitude?
这里大气极稀薄、阻力小，还能用货运飞船定期补推维持轨道；同时又方便载人往返和对地观测。
The air is thin enough that drag is small yet cargo craft can periodically reboost the orbit, while crew transport and Earth observation stay practical.
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
David Macaulay,《The Way Things Work》,Houghton Mifflin,1988;中译《万物运转的秘密》
D. Macaulay, The Way Things Work, Houghton Mifflin, 1988; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL15130328W：The Way Things Work（按标
#航天工程 #中国航天
为什么卫星能帮我们打电话和看电视？
Why can satellites help us make phone calls and watch TV?
卫星在高空接收地面发来的无线电信号，再转身转发给别的地方。这样信号能跨过大洋和山脉，送到很远。
High above, a satellite catches radio signals from the ground and beams them elsewhere. This lets signals cross oceans and mountains to reach faraway places.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
韩启德总主编《十万个为什么》(第六版),少年儿童出版社,2013
Han Qide chief ed., Ten Thousand Whys, 6th edition, Juvenile and Children Publishing House, 2013, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#卫星 #信号 #通讯
对地观测卫星为什么爱用'太阳同步轨道'？
Why do Earth-observation satellites favor sun-synchronous orbits?
它每天在相近地方时过顶，光照角度一致便于前后对比；近极地轨道还能覆盖全球大部分地区。
It passes overhead at nearly the same local time daily, giving consistent lighting for comparison, and a near-polar path covers most of Earth.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Curtis，《轨道力学》（第4版）
Curtis, 'Orbital Mechanics for Engineering Students' (4th ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787030253231（豆瓣书目条目: 轨道力学）
#航天工程 #中国航天
FAST为什么能'听'到宇宙中遥远的中性氢？
How can FAST 'hear' distant cosmic neutral hydrogen?
中性氢会发出21厘米特征谱线，FAST大口径高灵敏，可探测极远的星系分布和暗物质结构。
Neutral hydrogen emits a 21-cm spectral line; FAST's huge aperture and sensitivity trace very distant galaxies and dark-matter structure.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Ewen 与 Purcell,1951年,Nature,168卷356页:银河系1420兆赫中性氢辐射的首次探测
Ewen & Purcell 1951, Nature, 168, 356 - Observation of a line in the galactic radio spectrum at 1420 MHz
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1038/168356a0：Observation of a Line in th
#航天工程 #中国航天
火箭发射为什么都要'倒数'？
Why do rocket launches use a countdown?
倒数把加注、系统检查、瞄准发射窗口等步骤同步起来，留出有序准备和安全冗余，出问题可随时暂停。
The countdown synchronizes fuelling, checks and the launch window, giving orderly preparation and safety margin so any problem can halt the process.
难度 入门 · 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
Sutton & Biblarz,《Rocket Propulsion Elements》第9版,Wiley,2016
G. P. Sutton and O. Biblarz, Rocket Propulsion Elements, 9th ed., Wiley, 2016
独立核验依据 · Independent verification: 核验依据 2 ISBN 9780665590955 (2002)
#航天工程 #中国航天
为什么大风车会转？
Why do big wind turbines spin?
风吹动风车的长叶子，叶子连着里面的转轴。风一推，叶子转起来就能发电。
Wind pushes the long blades of a turbine, which are joined to a spinning shaft inside. As the blades turn, they make electricity.
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
David Macaulay,《The Way Things Work》,Houghton Mifflin,1988;中译《万物运转的秘密》
D. Macaulay, The Way Things Work, Houghton Mifflin, 1988; Chinese ed.
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL15130328W：The Way Things Work（按标
#风车 #风 #发电
火箭为什么要用多级，而不是一节一直烧到头？
Why are rockets multi-stage instead of one piece all the way?
扔掉烧空的燃料箱能大幅减重，质量比决定能否达到轨道速度；单级火箭很难把有效载荷送进轨道。
Jettisoning empty tanks cuts mass sharply; the mass ratio decides whether orbital speed is reachable. A single stage rarely suffices.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Sutton《火箭推进原理》；NASA 发射系统
Sutton, Rocket Propulsion Elements; NASA launch systems
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780665590955 (2002)
#航天工程 #中国航天