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These stars explode in a massive fireball called a supernova.
大質量恒星死亡時會爆炸成一個巨型火球，叫做“超新星”。
Not every kind of star can explode as a supernova.
不是每一種恒星都會爆炸成“超新星”。
The sun can't for example.
太陽就不行，
It just lacks the oomph.
因為太陽的能量不夠大。
It doesn't have the mass that you need to be able to get what happens in the core to make a star blow up.
太陽的質量不足以讓其內核發生爆炸而成為“超新星”。
There are a handful of stars in the galaxy that are definitely capable of doing this.
但是銀河系里有一大堆恒星絕對可以爆炸成“超新星”的。
Every star is carefully balanced between the inward pull of its gravity and the outward pressure of the heat it generates from nuclear fusion.
每個恒星都在小心的保持著其內部重力的牽引力和其核聚變產生的熱張力之間的平衡。
When it runs out of fuel, the pressure needed for balance is gone Gravity now reigns supreme.
當恒星的能量耗盡，熱張力消失重力就開始主導一切。
The star caves in and explodes.
恒星就會向內塌陷、爆炸。
The full fury of a supernova destroys the star and everything around it.
“超新星”爆炸的狂暴力量會毀滅它周圍的一切，包括恒星。
If the star was near enough to Earth, a wave of deadly Gama and X-rays would flood toward us, it could knock out satellite communications and cause global power outages.
如果爆炸的“超新星”越地球不遠，致命的伽馬射線和X射線就會向我們席卷而來，使我們的衛星通訊中斷，并讓全球電力中斷。
In fact, one such giant star has already exploded in our own galaxy,
實際上，已經有一顆巨型恒星在銀河系爆炸過，
Hubble Space Telescope recorded an image of the aftermath.
哈勃記錄下了爆炸后的景象。
The Crab Nebula is the expanding wreckage from a supernova that occurred in the year 1054.
蟹狀星云就是“超新星”爆炸的受害者，那次爆炸發生在公元1054年。
The explosion of the supernova was recorded by Chinese astronomers, so we know exactly when the explosion was.
那次“超新星”爆炸被中國古代天文學家記錄了下來，所以我們才能知道爆炸是在何時發生的。
The expanding debris from this thousand year-old supernova is still moving into space at about 5 million kilometers per hour,
那個有上千年歷史的“超新星”爆炸的殘留物至今還在以5百萬公里/小時的速度向太空中飛散，
But the image is more than just a snapshot of ancient history.
不過哈勃的圖像不光是遠古歷史的快照。
For scientists, the inter-connected web-like filaments offer a clue as to the nature of life itself.
對于科學家來說，這種相互關聯、往復循環的結構也是生命的本質。
The basic elements needed to create life are formed in the heart of stars.
產生生命的基本元素也在恒星的中心部位產生了。
When the stars explode, these fundamental elements are scattered throughout the universe, seeding distant nebula clouds which give birth to new planets and new life.
當恒星爆炸時，這些基礎元素會散落于宇宙之中，并在遙遠的星云中播下產生新恒星和新生命的種子。
