天鹅座：泡泡和新月
(原标题: Cygnus: Bubble and Crescent)
2023-09-04
浏览次数: 14
当恒星死亡时，它们会形成云。在我们银河系的平面上，当两团由气体和尘埃组成的恒星死亡云飘过丰富的恒星场时，可以发现它们正朝着飞翔的天鹅星座（天鹅座）飞去。在望远镜视野中捕捉到的是肥皂泡（左下）和新月星云（右上）。两者都在恒星生命的最后阶段形成。新月星云也被称为NGC 6888，它的形状是由于其明亮的中央大质量沃尔夫-拉叶星WR 136在强烈的恒星风中脱落了它的外壳。WR 136正以惊人的速度燃烧着燃料，它短暂的生命即将结束，它将以一场壮观的超新星爆炸而告终。肥皂泡星云于2013年被发现，它很可能是一个行星状星云，是一颗质量较低、寿命较长的类太阳恒星的最后一层，注定要变成一颗缓慢冷却的白矮星。这两个恒星星云相距约5000光年，较大的新月星云横跨约25光年。在几百万年之内，两者都可能分散。你的天空惊喜：APOD在你的生日上展示了什么照片？(1995后)
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As stars die, they create clouds. Two stellar death clouds of gas and dust can be found toward the high-flying constellation of the Swan (Cygnus) as they drift through rich star fields in the plane of our Milky Way Galaxy. Caught here within the telescopic field of view are the Soap Bubble (lower left) and the Crescent Nebula (upper right). Both were formed at the final phase in the life of a star. Also known as NGC 6888, the Crescent Nebula was shaped as its bright, central massive Wolf-Rayet star, WR 136, shed its outer envelope in a strong stellar wind. Burning through fuel at a prodigious rate, WR 136 is near the end of a short life that should finish in a spectacular supernova explosion. Discovered in 2013, the Soap Bubble Nebula is likely a planetary nebula, the final shroud of a lower mass, long-lived, Sun-like star destined to become a slowly cooling white dwarf. Both stellar nebulas are about 5,000 light-years distant, with the larger Crescent Nebula spanning about 25 light-years across. Within a few million years, both will likely have dispersed. Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)
© Abdullah Al-Harbi