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  • About 4.3 light-years from Earth lies our closest stellar neighborhood.

    我們最近的恆星鄰居,離地球約 4.3 光年。

  • The Alpha Centauri system consists of three known stars.


  • Alpha Centauri A and Alpha Centauri B are a binary pair, which means they orbit a common center of mass.


  • The third star, Proxima Centauri, is the closest to Earth at about 4.22 light-years away.

    第三顆恆星是比鄰星,距離地球最近,約 4.22 光年。

  • In 2016, astronomers detected an Earth-sized planet orbiting Proxima Centauri within the

    2016 年,天文學家在恆星的適居帶內,探測到一顆地球大小的行星,

  • star's habitable zone - the right distance to potentially support liquid water on its surface.


  • Which is why eyes are on Alpha Centauri as our first destination once we master interstellar travel.


  • So is this deep space journey possible in our lifetime?


  • And if so, how will we get there?


  • Outer space is bigger than we can comprehend


  • and sending a spacecraft into its depths takes a lot of time.


  • NASA's Voyager 1 is Earth's farthest spacecraft to date.

    NASA 的航海家 1 號是目前距離地球最遠的太空船。

  • It was launched in 1977, and in 2012, it was the first craft to enter interstellar space.

    它於 1977 年發射,在 2012 年,成為第一個進入星際空間的太空船。

  • If Voyager 1 was pointed in the direction of Alpha Centauri, it would still take tens of thousands of years to reach the system.

    如果航海家 1 號指向半人馬座α的方向,那到達該星系仍需數萬年。

  • And that's because its propulsion system is not ideal for deep space travel.


  • So clearly we need a faster way to get to our stellar neighbors.


  • Some scientists believe that our best attempt at interstellar travel are lightsails.


  • These sails would be made of ultra-thin sheets that will be propelled using light instead of wind.


  • One of the major initiatives researching their potential is Breakthrough Starshot.


  • The program, initially backed by late cosmologist Stephen Hawking, aims to create a nanocraft


  • comprised of a lightsail and a gram-scale wafer that hosts a number of instruments called a StarChip.


  • The nanocraft has a mirror-like sail design and is measured at 10 square meters with a mass of less than 1 gram.

    奈米太空船的帆為鏡像設計,在 10 平方公尺下測量,質量小於 1 克。

  • By comparison a penny weighs 2.5 grams,

    相比之下,一分錢是 2.5 克,

  • so these spacecraft will be ultralight.


  • The lightsail will purportedly be accelerated by laser radiation pressure from Earth at about 20 percent the speed of light.

    光線據說會受到地球雷射輻射壓力而加速,速度約為光速的 20%。

  • The planned laser array, called a Light Beamer, will fire beams as powerful as 100 gigawatts of specific wavelengths of near-infrared light.

    計畫中的雷射陣列稱為「雷射推進裝置」,可發射強度為 100 兆瓦,特定波長的近紅外光束。

  • The nanocraft sail would need to reflect a huge majority of the laser light to avoid instantly burning up on contact.


  • The idea is to launch thousands of nanocraft at once to increase the chances that at least


  • a few will conquer the elements and reach Alpha Centauri.


  • If they do make it, it's estimated, the journey will only take around 20 years.

    如果它們可以做到,估計這趟旅程只需 20 年左右。

  • Though some critics are skeptical about the ability to execute Breakthrough Starshot,


  • some of the world's greatest minds are actively working to make it a reality.


  • The project is pushing the boundaries of science, challenging humans to create an entirely new


  • material that meets all the extreme needs of the lightsails


  • and to design the largest laser ever constructed.


  • But, if engineers and scientists are able perfect these pint-sized spacecraft and we


  • achieve interstellar travel, humanity will be rewarded with an entirely new understanding of the alien worlds beyond our own.


  • If you're looking to learn more about space exploration and astronomical phenomena be sure to watch this episode of Space Crafts.

    如果你想學更多關於太空探索和天文現象的知識,一定要記得觀看 Space Crafts 這集的內容。

  • And don't forget to subscribe to Seeker for all things science.

    為了學到所有的科學知識,別忘了訂閱 Seeker 。

  • Thanks for watching!


About 4.3 light-years from Earth lies our closest stellar neighborhood.

我們最近的恆星鄰居,離地球約 4.3 光年。


影片操作 你可以在這邊進行「影片」的調整,以及「字幕」的顯示

B2 中高級 中文 美國腔 太空船 恆星 奈米 雷射 星際 到達

我們將如何去半人馬座阿爾法星? (How Will We Get to Alpha Centauri?)

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    Jerry Liu 發佈於 2021 年 01 月 14 日