?氣泡星云 這個巨大的太空氣泡是由一個巨大的恒星吹出的，在10點鐘的位置可以看到。這個“氣泡”直徑已經(jīng)超過7光年，以超過400萬英里每小時的速度膨脹，實際上是當膨脹的熱氣體(或恒星風)撞擊它周圍的冷星際氣體時產(chǎn)生的沖擊波。泡沫星云是在1787年由威廉·赫歇爾發(fā)現(xiàn)的。里面的恒星生活得很快，而且會在年輕時死去(對于一顆恒星來說)——它可能會在1000萬到2000萬年后爆炸成為超新星。這張照片是哈勃太空望遠鏡在2016年拍攝的，以紀念STS-31航天飛機機組人員發(fā)射哈勃進入地球軌道26周年。我們展示這張照片是為了紀念世界空間周的最后一天。世界空間周是一年一度的“國際科學技術及其為改善人類狀況所做貢獻的慶?；顒印薄?/p>

原文:

This giant space bubble is being blown by a massive star visible at the 10 o'clock position inside it. Already over 7 light-years across and expanding at a rate of over 4 million mph, the 'bubble' is actually the shock wave created when expanding hot gas (or stellar wind) hits the cold, interstellar gas that surrounds it. The Bubble nebula was discovered in 1787 by William Herschel. The star inside is living fast and will die young (for a star)—it will likely detonate as a supernova in only 10 to 20 million years. This image was taken in 2016 by the Hubble Space Telescope to mark the 26th anniversary of Hubble's launch into Earth orbit by the STS-31 space shuttle crew. We're showing it to mark the last day of World Space Week, an annual 'international celebration of science and technology, and their contribution to the betterment of the human condition.'

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