月球为什么正在慢慢远离地球？
Why is the Moon slowly moving away from Earth?
潮汐摩擦把地球自转的一部分角动量转移给月球轨道，使月球每年远离约3.8厘米。同时地球自转因此略微变慢，一天的长度在缓慢增加。这是角动量守恒在地月系统中的直接体现。
Tidal friction transfers some of Earth's rotational angular momentum into the Moon's orbit, pushing the Moon outward by about 3.8 centimeters per year. Earth's spin slows slightly as a result, lengthening the day. This is angular-momentum conservation acting in the Earth-Moon system.
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
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#月球 #潮汐摩擦 #角动量
月球怎样帮助稳定地球的自转轴？
How does the Moon help stabilize Earth's axial tilt?
月球的引力像一根『锚』，减弱了其他行星对地球自转轴的扰动，使地轴倾角长期保持在约23.5度附近。若没有这样的大卫星，地轴可能剧烈摆动，导致气候极端不稳。这种稳定被认为有利于地球生命的长期演化。
The Moon's gravity acts like an anchor that damps perturbations from other planets, keeping Earth's axial tilt near a steady 23.5 degrees. Without such a large moon the tilt could wobble wildly, causing extreme climate instability. This stability is thought to have helped life persist on Earth.
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
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#月球 #自转轴 #稳定
为什么农历初一和十五容易出现大潮？
Why do spring tides occur near the new and full moon?
当太阳、月球和地球大致排成一线（朔或望）时，太阳和月球的引潮力叠加，形成潮差最大的大潮。而在上弦、下弦时两者相互垂直，引潮力部分抵消，形成小潮。因此大潮约每半个月出现一次。
When the Sun, Moon and Earth line up near new or full moon, their tidal forces add together and produce the largest tidal range, called spring tides. At first and last quarter they sit at right angles and partly cancel, giving neap tides. So spring tides come about every two weeks.
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
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#大潮 #小潮 #朔望
潮汐的能量可以被人类利用吗？
Can humans harness the energy of tides?
可以。潮汐涨落带动大量水体运动，蕴含可观的机械能。人类在海湾或河口修筑潮汐电站，利用水位差驱动水轮发电，如法国的朗斯电站。潮汐规律而可预测，是稳定的清洁能源，但选址和生态影响较大。
Yes. The rise and fall of tides move huge volumes of water, holding significant mechanical energy. People build tidal power plants in bays or estuaries that use the height difference to drive turbines, like France's Rance station. Tides are predictable clean energy, though siting and ecology are concerns.
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
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#潮汐 #发电 #清洁能源
什么是潮汐锁定？它普遍吗？
What is tidal locking, and is it common?
潮汐锁定指一颗天体自转周期与公转周期同步，永远以同一面朝向主星，如月球对地球。它是长期潮汐摩擦的结果，在卫星中十分常见：冥卫一、木卫一等许多卫星都被母行星锁定。太阳系外也普遍如此。
Tidal locking means a body's rotation period matches its orbital period so it always shows one face to its primary, as the Moon does to Earth. It arises from long-term tidal friction and is very common among moons: Charon, Io and many others are locked to their planets. It is widespread beyond the solar system too.
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
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#潮汐锁定 #卫星 #自转
月球为什么几乎没有大气？
Why does the Moon have almost no atmosphere?
月球质量小、表面引力弱，逃逸速度只有约每秒2.4公里，气体分子很容易达到逃逸速度飞散到太空。加上没有磁场和地质活动补充气体，任何大气都难以长期保留。因此月球表面几乎是真空。
The Moon is small and weakly gravitational, with an escape velocity of only about 2.4 kilometers per second, so gas molecules easily reach it and drift into space. With no magnetic field or geology to replenish gas, any atmosphere cannot persist. The lunar surface is thus nearly a vacuum.
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
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#月球 #大气 #逃逸速度
海水的潮汐是怎么形成的？
How are ocean tides produced?
潮汐主要由月球引力对地球不同部位拉扯不均造成：正对月球和背向月球的两侧海水被『抬高』形成涨潮。太阳的引力也会叠加影响，但月球的贡献约为太阳的两倍。地球自转使各地每天经历约两次涨落。
Tides are mainly caused by the Moon's uneven pull on different parts of Earth: water on the near and far sides bulges out into high tide. The Sun's gravity adds its own effect, but the Moon contributes about twice as much. Earth's rotation gives most places about two tides per day.
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CC BY 4.0 · 已核验 · Verified 2026-11-03
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牛顿《自然哲学的数学原理》的引潮力理论；美国国家海洋和大气管理局 (NOAA) 潮汐说明
Newton's tidal theory in Principia; NOAA Tides and Currents on tide generation
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787100045131（豆瓣书目条目: 自然哲学的数学原理）；本条出处含多部著作，此标识只担保上面
#潮汐 #月球引力 #太阳
为什么我们有时也能看到月球的一点点背面？
Why can we occasionally see a little of the Moon's far side?
月球并非完全只露正面，由于『天平动』，它绕地球运动时会有轻微摆动和倾斜，使边缘区域轮流露出。综合几种天平动，我们累计能看到的月面约59%而非严格的50%。其余约41%确实永远背对地球。
The Moon does not show only its near side; thanks to 'libration', slight wobbles and tilts as it orbits let edge regions appear in turn. Combined, the effects let us see about 59 percent of the lunar surface rather than exactly half. The remaining 41 percent truly stays hidden.
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
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#月球 #天平动 #背面
日食和月食有什么不同？
What is the difference between a solar and a lunar eclipse?
日食发生在新月时，月球跑到太阳和地球之间，挡住太阳光。月食发生在满月时，地球位于太阳和月球之间，地球的影子投到月球上。日食只在地球上狭窄的带状区域可见，月食则半个地球夜半球都能看到。
A solar eclipse happens at new moon when the Moon passes between the Sun and Earth and blocks sunlight. A lunar eclipse happens at full moon when Earth lies between the Sun and Moon and casts its shadow onto the Moon. A solar eclipse is visible only along a narrow path, while a lunar eclipse can be seen across half the night side of Earth.
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
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#日食 #月食 #月球
为什么月球总是同一面朝向地球？
Why does the Moon always show us the same face?
这是潮汐锁定的结果：地球对月球的引力在月球上引起形变和摩擦，长期拖慢了月球的自转。最终月球自转周期和它的公转周期变得一致，都是约27.3天。于是我们在地球上始终只能看到月球的正面。
This is tidal locking: Earth's gravity creates bulges and friction in the Moon that slowly braked its spin. Eventually the Moon's rotation period matched its orbital period, both about 27.3 days. So from Earth we always see only the Moon's near side.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
默里与德莫特《太阳系动力学》(Murray & Dermott, Solar System Dynamics) 关于潮汐锁定
Murray & Dermott, Solar System Dynamics, on tidal locking
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL14864313W：Solar system dynamics（
#月球 #潮汐锁定 #自转
月亮的阴晴圆缺是怎么形成的？
Why does the Moon show phases?
月球本身不发光，我们看到的月光是它反射的太阳光。随着月球绕地球转动，它被太阳照亮的一面以不同角度朝向地球，于是出现新月、上弦、满月、下弦等月相变化。一个完整的朔望月约29.5天。
The Moon does not shine by itself; the moonlight we see is reflected sunlight. As the Moon orbits Earth, the sunlit half faces us at changing angles, producing new moon, first quarter, full moon and last quarter. A full lunar cycle, the synodic month, lasts about 29.5 days.
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
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#月球 #月相 #公转
月球表面为什么布满坑坑洼洼的撞击坑？
Why is the Moon's surface covered with craters?
月球几乎没有大气和地质活动，数十亿年来被小行星和彗星撞击留下的坑洼都保存了下来。没有风雨侵蚀和板块运动去抹平它们，因此撞击坑密集而清晰。通过统计坑的密度还能推测月球表面的年龄。
The Moon has almost no atmosphere or geological activity, so craters left by asteroid and comet impacts over billions of years are preserved. With no weather erosion or plate tectonics to erase them, the craters remain sharp and dense. Counting crater density even helps estimate the age of lunar surfaces.
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
苏宜,《天文学新概论》第5版,科学出版社
Su Yi, Introduction to Astronomy, 5th ed., Science Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787030620477（豆瓣书目条目: 天文学新概论）
#月球 #撞击坑 #陨石