跟读练习: Astronomers Just Found Earth's Secret Second Moon - 通过视频学习英语口语
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In 2024, Earth was joined by a mini-moon that orbited around our planet for two months.
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It hung around, made a few laps, and then, like every polite guest, it left.
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It went back to resume its trip around the Sun.
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However, astronomers now say another rock has been tagging along with Earth not for weeks, but for six decades.
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It's rare and strange, now being classified as a quasi-moon.
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But what exactly does that mean?
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Is it like a backup satellite?
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Unlike our cool and mysterious moon that illuminates our nights and affects werewolves, a quasi-moon doesn't circle Earth.
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Instead, it orbits the Sun, but it does so almost in perfect sync with us, like a runner doing a marathon with you that keeps a similar pace.
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Space only seems calm.
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It's actually pretty chaotic.
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The Sun, the Moon, Earth, and even other planets are constantly tugging on each other and smaller objects like these rocks.
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Most asteroids can't hold this delicate balance for long.
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They either get nudged into a new orbit, pulled closer to Earth, or flung out into the vast reaches of space.
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That's why we're lucky to spot more than one or two at a time.
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Most just can't keep the balance.
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They belong to a bigger family called co-orbitals.
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In fact, astronomers group them into a few types based on how they move relative to Earth.
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But unlike the real Moon, that's been our companion since the very beginning, these visitors don't stick around forever.
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Some hang with us for a few decades, others for centuries, before drifting away because of the gravity of some other space object.
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Kind of like a dog running to your neighbor after smelling bacon.
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One other thing about quasi-moons is their size.
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Most are tiny, building-sized, or even smaller.
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They're also so dim that they can hide in plain sight among stars.
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Still, they're important.
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By studying them, astronomers learn how small near-Earth objects move and how long they can stay caught in Earth's gravity.
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Quasi-moons are closer than other asteroids on the same path, and it would be easier to reach them.
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One day, they might be used as stepping stones in space exploration.
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Earth has had a few of these tagalongs before.
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One of the most famous is 2016 H03, nicknamed Earth's Constant Companion.
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It's only about 300 feet wide, but it's been keeping pace with us for nearly a century.
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Researchers say it might keep up for centuries more.
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But what about the most recently discovered one?
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The researchers named it 2025 PN7.
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Like we said, it's already been with us for 60 years and will likely stay for around 68 more.
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For a long time, it remained undiscovered because of its tiny size, only about 62 feet across, which is about the length of a bowling lane.
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This also answers the question of whether you could see it yourself if you knew where to look.
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Its backstory is a bit of a mystery.
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Astronomers haven't figured out its composition yet.
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Right now, all we know for sure is its trajectory.
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Some quasi-moons are just near-Earth asteroids that fell into a perfect orbit.
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Others seem like they could be chunks of the moon itself.
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For instance, there's another quasi-moon named Kamo'o'a Loea
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that reflects light in almost the same way as the lunar rocks we brought back during the Apollo missions.
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Because of that, some researchers think it might actually be left over from a huge impact that happened long ago.
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There's also 2024 PT5, a temporary mini-moon from the end of last year.
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Tests showed that its surface looks like lunar basalt, suggesting it probably came from the moon.
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So, how do these quasi-moons pull off their cosmic balancing act?
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That's because it's just an orbital illusion.
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Remember, PN7, like other quasi-moons, isn't actually circling our planet.
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To us, it looks like the rock is scribbling lazy loops around Earth's path, like doodles in space.
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Yet, it never lags too much or gets too far.
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Astronomers call this a one-to-one resonance.
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In plain English, it makes a lap around the sun every time Earth does.
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Another fun question.
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If these fake moons are so close to Earth, why don't we just pull them in with our gravity?
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Especially since they're tiny and seem so near.
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That's because even though they belong to a group called near-Earth objects, quasi-moons are not that close.
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Our moon is hanging out about 239,000 miles away.
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These companions, though, are flying around the sun millions of miles out, way beyond Earth's gravitational pull.
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That pull exists within an area called the hillsphere, which is where Earth's gravity is stronger than the sun's.
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Think of Earth's gravity as a bubble with a radius of about a million miles.
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Anything inside can get caught, like the real moon.
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Step outside, and the sun takes over.
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This is exactly what happened to PT5.
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which was our legit satellite for two months in 2024.
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It dipped inside the hill sphere, and Earth's gravity took over.
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Once it happened, this object became known as a mini-moon.
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But because it was small and moving fast, it eventually slipped back out of that bubble, and the Sun's gravity pulled it away again.
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One other type of co-orbiter, aside from quasi-moons and mini-moons, is the so-called horseshoe orbiters.
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These space rocks don't stray far, but from Earth's point of view, they seem to swing ahead of us, slow down, then drift back behind, and repeat.
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It's like an undercover cop tailing you in traffic, but constantly switching lanes and doubling back so you don't notice the pattern.
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If you trace their motion from Earth, over time, it forms a giant horseshoe shape, hence the name.
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And these are just the main co-orbiters.
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There are actually more.
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Way ahead of us and way behind us in space, there are a few quirky rocks called Trojans.
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They're not just following right next to Earth like quasi-moons do.
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Instead, they found two special hiding spots.
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One 60 degrees in front of us and one 60 degrees behind.
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Imagine riding your bike and having a friend way ahead of you and another one way behind.
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both keeping the same speed.
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That's what Trojans do.
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Those spots are called Lagrange points, cozy hangout regions where the gravitational pulls from Earth and the Sun balance out perfectly.
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When they find themselves in one of those areas, they could be staying there for millions of years without drifting away.
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Jupiter, for example, has tons of these freeloaders.
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Earth has only a few.
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Then there are tadpole orbiters.
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Instead of sitting perfectly still in a Lagrange point, they wobble around it in lazy, bean-shaped loops.
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And if that's not confusing and overwhelming enough, there are also jumping Trojans.
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The indecisive ones.
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These guys can't pick a side.
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They'll spend a few thousand years staying in the front hammock, then slowly drift to one behind us and back again.
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Rare, weird, and kind of awesome.
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So even though Earth only has one big moon in the sky, we've actually got a whole gang of intrusive space tagalongs.
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Some loop, some trail, some hide in the corners.
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Now let's recap the superpowers of our moon.
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It can affect tides, slow down Earth's rotation, and even help stabilize our planet's tilt.
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Without the moon, our days would be shorter, our nights darker
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and the seasons way more chaotic the moon also acts like a giant shield sweeping up
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or deflecting some space rocks that might otherwise smack into earth
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and let's not forget its cultural influence it's been inspiring myths calendars love songs
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and millions of melancholic walks in the middle of the night
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fake moons can't compete however they are important in their own
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way each new quasi moon we find helps us understand how these little rocks survive in all
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that cosmic chaos by learning about our environment we also learn something about ourselves they sharpen our detection skills
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and help us improve our models so
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while they'll never shine in the night sky they still play
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a quiet role in helping us understand our quirky cosmic neighborhood That's it for today.
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So hey, if you pacified your curiosity, then give the video a like and share it with your friends.
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Or if you want more, just click on these videos and stay on the bright side.
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本课的词汇与口语要点
这段视频共有 110 个句子、1415 个单词可供跟读。 讲话部分时长为 9:21。 说话人语速自然，每分钟约 151 个词，接近日常对话。 只有 81% 的单词属于英语最常用的 3,000 词，词汇难度较高。
视频中的重点词汇
视频中 15 个值得学习的单词，附发音和释义：
| 单词 | 发音 | 释义 |
|---|---|---|
| orbit 名词 | /ˈɔɹ.bɪt/ | 軌道 /轨道, 軌跡 /轨迹 |
| loop 名词 | /luːp/ | 圈, 環 /环 |
| companion 名词 | /kəmˈpæn.jən/ | 伴侶 /伴侣, 同伴 |
| researcher 名词 | /ˈɹiˌsɝ.t͡ʃɚ/ | 研究員 /研究员, 研究者 |
| cosmic 形容词 | /ˈkɑz.mɪk/ | 宇宙的 |
| asteroid 名词 | /ˈæst(ə)ɹɔɪd/ | 小行星 |
| plain 名词 | /pleɪn/ | 平原, 平野 |
| belong 动词 | /bɪˈlɒŋ/ | 屬於 /属于 |
| pace 名词 | /peɪs/ | 步伐, 步幅 |
| satellite 名词 | /ˈsætəlaɪ̯t/ | 衛星 /卫星 |
| lazy 形容词 | /ˈleɪ̯zi(ː)/ | 懶 /懒, 懶惰 /懒惰 |
| bubble 名词 | /ˈbʌbəl/ | 泡, 氣泡 /气泡 |
| chaotic 形容词 | /keɪˈɑtɪk/ | 混亂 /混乱 |
| orbital 形容词 | /ɔɹ.bət.l̩/ | 眼眶的, 眶的 |
| vast 形容词 | /væst/ | 浩大 |
视频中出现的短语动词
| 单词 | 释义 |
|---|---|
| slow down 动词 | 減速 /减速, 放慢 |
| take over 动词 | 接管, 接手 |
| figure out 动词 | 弄清楚 |
视频中的语法
说话人最常用的结构，并附上视频中的原话：
| 结构 | 视频中的用法 |
|---|---|
| 被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的 | was joined · being classified · be left |
| 定语从句 who / which + 从句 — 补充说明人或事物 | across, which is · hillsphere, which is |
需要注意的发音
说话人用了 19 次缩略和弱读形式，例如 can't, don't, they're。请按听到的简短形式来说。
- “th” 音: marathon /ˈmæɹəθən/, myth /mɪθ/
- “sh” 和 “zh” 音: composition /ˌkɑm.pəˈzɪʃ.ən/, shield /ˈʃild/, exploration /ˌɛkspləˈɹeɪʃən/, shine /ʃaɪn/, rotation /ɹoʊˈteɪʃən/
- 长单词——注意重音位置: temporary /ˈtɛmp(əˌɹ)ɛɹi/, composition /ˌkɑm.pəˈzɪʃ.ən/, exploration /ˌɛkspləˈɹeɪʃən/, mysterious /mɪˈstɪɹi.əs/, curiosity /ˌkjʊɹ.iˈɑ.sə.ti/
如何用这段视频练习
- 先完整听一遍视频，不要开口，记下不认识的单词。
- 先用 0.75 倍速逐句跟读，熟练之后再回到正常速度。
- 录下自己的声音并与原声对比，特别注意 orbit, loop, companion 这类单词。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。