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  • Since the launch of Sputnik I kicked off the space age in 1957, our skies have steadily been filling up with more and more artificial satellites.

    自從 1957 年發射的史普尼克一號揭開了太空時代的序幕,如今我們的天空已經穩定地充滿了越來越多的人造衛星。

  • Right now, there are about 7,000 in orbit, and the pace of launches is only set to accelerate as space travel gets cheaper and companies envision mega-constellations.

    現在,大約有 7000 個在運行中,而且隨著太空旅行變得更便宜,某些公司計劃投放通訊衛星巨型星系,發射衛星的速度只會加快。

  • While space may be a pretty big place, there is a finite limit to just how much stuff can safely be whizzing around the Earth.


  • So, to paraphrase a song from my youth, what are we gonna do with all that junk, all that junk in outer space?


  • And believe me, there is already a lot of junk up there.


  • Of those 7,000 or so satellites I mentioned, about 3,000 of them are defunct and not serving any purpose.

    在我提到的那 7000 多顆衛星中,大約有 3000 顆已經停用,沒有任何作用。

  • Some of them are huge, like ESA's Envisat which is as big as a double-decker bus.

    其中一些是巨型的,如歐洲太空總署的 Envisat ,有雙層巴士那麼大。

  • There have been several close calls as dead satellites guided only by the hand of physics nearly collided.


  • Sometimes they only miss each other by just a dozen meters, and sometimes they don't miss at all.


  • Like in 2009 when an inactive Russian Cosmos satellite collided with a very-much active Iridium communications satellite.

    比如在 2009 年,一顆不活躍的俄羅斯宇宙號衛星與一顆非常活躍的銥衛星相撞。

  • That collision generated thousands of pieces of debris, and in space, the small stuff can't be overlooked.


  • NASA estimates there are more than 23,000 pieces of debris larger than 10 centimeters in orbit around the Earth, and there are hundreds of millions more pieces smaller than that.

    美國國家航空航天局估計有超過 23,000 塊大於 10 公分的碎片散布在圍繞地球的軌道上,而且還有數以億計的比這更小的碎片。

  • Doesn't sound very big, but at the extreme speeds they're moving, they pose a risk to active satellites and the International Space Station.


  • In fact, in May of 2021, astronauts inspecting the ISS discovered damage to the station's robotic arm that was caused by one of these tiny pieces of junk.

    事實上,在 2021 年 5 月,檢查國際太空站的太空人發現太空站的機械手臂受到了損壞,這是由其中一個微小垃圾造成的。

  • The arm is still functioning, but it could have been worse.


  • The worst-case scenario was imagined by NASA scientist Donald J. Kessler back in 1978.

    最壞的情況是美國宇航局科學家唐納德・J・凱斯勒在 1978 年就想像到的。

  • The so-named Kessler syndrome is where more satellites like Cosmos and Iridium collide and the resulting debris creates a runaway chain reaction that damages more satellites, creating more debris that ultimately renders low-earth orbit unusable.


  • There are a few solutions in the works in an effort to stave off that bleak possible future.


  • A proof-of-concept for one of them launched in March of 2021.

    其中一個的概念驗證於 2021 年 3 月推出。

  • The project, dubbed the End of Life Services by Astroscale demonstration, or ELSA-d, is a collaboration between the Tokyo startup Astroscale and JAXA.

    該項目被稱為「天體規模的生命終結服務」,即 ELSA-d,是東京創業公司 Astroscale 和 JAXA 之間的合作。

  • The demonstrator consists of two satellites, a larger one with a magnet and a smaller one with a plate the magnet is designed to latch onto.


  • The two launched attached to one another but once all systems check out, the satellites will conduct a test in three stages.


  • First, they'll split up and the larger one will attempt to recapture its counterpart.


  • If all goes well, they'll split again, this time with the target satellite traveling in a tumbling orbit that more closely mimics the behavior of space junk.


  • If they recouple a second time, they'll split once more and the larger one will lose the smaller one, intentionally.


  • Now, If they manage to find each other and couple a third time, the demonstrator will be considered a success and ELSA-d will deorbit and burn up in the atmosphere.

    現在,如果他們設法找到對方並第三次結合,該展示機將被認為是成功案例,而 ELSA-d 將脫離軌道並在大氣中燒毀。

  • Even if all goes as planned, this system has its limits.


  • Astroscale's approach to junk management requires the space junk to have that magnetic plate, so while it could work for future satellites that incorporate it into their design, it doesn't solve the problem of the several thousand dead hunks of metal that are currently up there.

    Astroscale 的垃圾管理方法要求太空垃圾有那個磁板,所以,雖然未來的衛星可能將其納入設計中,Astroscale 的垃圾管理方法便能夠適用, 這並不能解決目前在上面幾千塊失去作用的金屬塊的問題。

  • To tackle that issue, the Swiss company ClearSpace is developing a tentacled contraption and aims to take down a large piece of an ESA booster rocket by 2025.

    為了解決這個問題,瑞士公司 ClearSpace 正在開發一種有觸手的裝置並力爭在 2025 年前拿下歐空局的一大塊火箭推進器。

  • One other idea is to refuel dead or dying satellites in orbit, eliminating the need to replace them or at least making it possible for them to move out of harm's way.


  • NASA is planning one such refueling mission called OSAM-1 in the coming years.

    美國宇航局正計劃在未來幾年內進行一次這樣的加油任務,名為 OSAM-1。

  • Of course, there is another option and that is justto not send up so many new satellites.


  • If space junk is allowed to come down at a faster rate than we put stuff up there, the skies will steadily become less crowded.


  • But with multiple companies planning global communication networks each made up of thousands of satellites, that idea probably isn't getting off the ground.


  • This issue is a long way from being solved.


  • There are so many satellites in orbit now that even if we stopped all launches, some scientists believe the Kessler syndrome could still become a reality.


  • Space junk comes in such a wide variety of shapes and sizes that no one approach will be the solution that cleans up low Earth orbit.


  • And these technologies could also have a sinister side: something that de-orbits a junk satellite could also bring down an active one, something that will no doubt concern governments and militaries of the world.


  • Doing something with all that junk is going to require a lot of creativity, trust, and forward-thinking if we're going to make sure there's enough space in space.


  • If you're curious why companies would want to create mega-constellations of satellites, check out my video on SpaceX's Starlink project here.

    如果你好奇為什麼公司會想要創建通訊衛星巨型星系,請看我關於 SpaceX 的 Starlink 項目的視頻。

  • Are you worried about the Kessler Syndrome going from scary hypothetical to reality?


  • Why or why not?


  • Sound off in the comments, be sure to subscribe, and I'll see you next time on Seeker.

    在評論中發表意見,請務必訂閱,我們下次在 Seeker 上見。

Since the launch of Sputnik I kicked off the space age in 1957, our skies have steadily been filling up with more and more artificial satellites.

自從 1957 年發射的史普尼克一號揭開了太空時代的序幕,如今我們的天空已經穩定地充滿了越來越多的人造衛星。

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