20191010 气泡星云 必应壁纸

 气泡星云 这个巨大的太空气泡是由一个巨大的恒星吹出的，在10点钟的位置可以看到。这个“气泡”直径已经超过7光年，以超过400万英里每小时的速度膨胀，实际上是当膨胀的热气体(或恒星风)撞击它周围的冷星际气体时产生的冲击波。泡沫星云是在1787年由威廉·赫歇尔发现的。里面的恒星生活得很快，而且会在年轻时死去(对于一颗恒星来说)——它可能会在1000万到2000万年后爆炸成为超新星。这张照片是哈勃太空望远镜在2016年拍摄的，以纪念STS-31航天飞机机组人员发射哈勃进入地球轨道26周年。我们展示这张照片是为了纪念世界空间周的最后一天。世界空间周是一年一度的“国际科学技术及其为改善人类状况所做贡献的庆祝活动”。

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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