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We don't actually know if aliens exist, but if they do, their cells probably have a special type of membrane.
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And that knowledge alone tells us where we can look for them, and maybe even what they'll be like.
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Hi, I'm David, and this is MinuteEarth.
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There are lots of different ways scientists can search for life on other planets.
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They can listen for radio signals from alien civilizations.
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They can scan distant atmospheres for the chemical fingerprints life leaves behind.
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And they can send spacecraft to sample places in our own solar system where life might be hiding.
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Or they can search for places that have the right conditions for a particular type of membrane to form.
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This last one is actually a pretty powerful tool for zeroing in on possible extraterrestrial life,
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because virtually every cell on Earth is wrapped in a membrane that keeps its contents inside,
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builds up a gradient by piling charged particles on one side, and then captures energy as those particles flow back through to the other.
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These membranes, we can call them electrochemical membranes, are so fundamental to life that many experts think that extraterrestrial life will likely have them too.
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On Earth, electrochemical membranes are formed from a specific set of elements, carbon, hydrogen, oxygen, nitrogen, and phosphorus, which can form molecules that,
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in the presence of liquid water, assemble into, well, membranes.
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And those membranes in turn form the foundation of life on Earth.
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So one way to find extraterrestrial life is to look for other worlds
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that have those same elements and the liquid water
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that would allow them to self -assemble and some sort of energy to power the life forms.
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And there are two of those worlds relatively nearby.
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Saturn's moon Enceladus has all of those elements and liquid water, though the ocean is buried under a thick shell of ice.
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So the membranes crucial to life could potentially form on Enceladus.
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But without direct sunlight, there's not much energy available.
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Any life
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that formed there would likely have to rely on the trickle of energy coming from hydrothermal vents on the ocean floor.
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So I imagine that any life there would be small and live right next to those vents.
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Jupiter's moon Europa also has all five of those membrane -building elements and a liquid ocean under an icy shell.
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But unlike energy -poor Enceladus, Europa is constantly being bombarded by radiation from Jupiter,
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and experiences much more tidal heating as it gets pushed and pulled by the massive planet.
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So if there is life on Europa, perhaps it's faster moving because it has more access to that energy.
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And then there's K2 -18b, a planet about 120 light -years away from us.
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From spectroscopy, we're pretty sure that it has at least three of the required elements to build
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Earth -like electrochemical membranes, and it may even have liquid water.
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But it's also surrounded by a thick layer of hydrogen gas, which for complicated chemistry reasons,
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some scientists speculate would lead not to the development of lots of individual membranes, but instead one big one.
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So that makes me envision alien life on K2 -18b that's not multiple organisms, but instead a single giant film that covers the entire world.
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And life may not actually be limited to worlds with exact
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Earth -like chemistry, because scientists think that in some cases, electrochemical membranes might be able to form from slightly different ingredients.
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The clouds surrounding
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Venus, for example, have no liquid water.
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So Earth -like membranes couldn't form there.
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And even if they did, the clouds are made of concentrated sulfuric acid, which would destroy those membranes on contact.
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What scientists have discovered, though, is that electrochemical membranes built with sulfur can actually self -assemble and survive in strong acid.
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So any life on Venus would probably have to form inside droplets of sulfuric acid.
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And because those droplets would have access to plenty of energy from sunlight as they floated up and down in the clouds,
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I picture excited aliens bopping around in their little acid bubbles.
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Again, we still don't know whether aliens exist.
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But focusing on the likelihood that they'll have electrochemical membranes doesn't just tell us where to look.
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It also hints that whatever we find could be deeply weird.
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Vocabolario e note di pronuncia per questa lezione
Questa lezione di conversazione si basa sul video “Four Places We Might Find Aliens”. Le parole che ritornano più spesso: membrane, energy, electrochemical, liquid, Earth. Questo video contiene 48 frasi e 718 parole da ripetere con lo shadowing. Il parlato dura 3:25. Chi parla va veloce, circa 210 parole al minuto: aspettati suoni legati e ridotti. Solo il 79% delle parole rientra nelle 3.000 più comuni dell’inglese, quindi il lessico è impegnativo.
Vocaboli chiave di questo video
15 parole del video che vale la pena imparare, con pronuncia e significato:
| Parola | Pronuncia | Significato |
|---|---|---|
| liquid sostantivo | /ˈlɪk.wɪd/ | liquido |
| element sostantivo | /ˈɛləmənt/ | elemento |
| acid sostantivo | /ˈæsɪd/ | acido |
| scientist sostantivo | /ˈsaɪəntəst/ | scienziato, scienziata |
| membrane sostantivo | /ˈmɛm.bɹeɪn/ | membrana |
| cloud sostantivo | /ˈklaʊ̯d/ | nuvola, nube |
| assemble verbo | /əˈsɛm.bəl/ | assemblare, montare |
| thick aggettivo | /θɪk/ | spesso |
| shell sostantivo | /ʃɛl/ | conchiglia |
| chemistry sostantivo | /ˈkɛm.ɪ.stɹi/ | chimica |
| hydrogen sostantivo | /ˈhaɪdɹəd͡ʒ(ə)n/ | idrogeno |
| particle sostantivo | /ˈpɑɹtək(ə)l/ | granello, pezzetto |
| sunlight sostantivo | /ˈsʌnˌlaɪt/ | luce solare |
| vent sostantivo | /vɛnt/ | sfogo, sfiatatoio |
| surround verbo | /səˈɹaʊnd/ | circondare |
I phrasal verb che sentirai
| Parola | Significato |
|---|---|
| build up verbo | accumulare |
Pronuncia a cui fare attenzione
Chi parla usa 8 contrazioni e forme ridotte, come don't, they'll, couldn't. Pronunciale nella forma breve, così come le senti.
- I suoni “sh” e “zh”: shell /ʃɛl/, capture /ˈkæp.(t)ʃɚ/, potentially /pəˈtɛnʃ(ə)li/, crucial /ˈkɹuː.ʃəl/, radiation /ˌɹeɪ.diˈeɪ.ʃən/
- Parole lunghe — attenzione all’accento: complicated /ˈkɑm.plɪˌkeɪ.tɪd/, potentially /pəˈtɛnʃ(ə)li/, fundamental /ˌfʌn.dəˈmɛn.təl/, radiation /ˌɹeɪ.diˈeɪ.ʃən/, virtually /ˈvɚ.t͡ʃə.wə.li/
I suoni difficili per chi parla italiano:
- /h/ — va soffiata, non è muta: hydrogen /ˈhaɪdɹəd͡ʒ(ə)n/, hint /hɪnt/, likelihood /ˈlaɪklihʊd/
- Consonante finale — senza aggiungere una vocale dopo: liquid /ˈlɪk.wɪd/, element /ˈɛləmənt/, acid /ˈæsɪd/, scientist /ˈsaɪəntəst/, cloud /ˈklaʊ̯d/
- /æ/ — più aperta della “e”: acid /ˈæsɪd/, atmosphere /ˈætməsˌfɪɹ/, capture /ˈkæp.(t)ʃɚ/, wrap /ɹæp/, scan /skæn/
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Inizia a velocità 0,75×, fai shadowing frase per frase e torna alla velocità normale quando diventa facile.
- Registrati e confronta con l’originale, facendo attenzione a parole come liquid, element, acid.
Cos'è la tecnica dello Shadowing?
Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.