超新星遗迹仙后座A
(原标题: Supernova Remnant Cassiopeia A)
2023-12-14
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银河系中的大质量恒星过着壮观的生活。它们的核炉从巨大的宇宙云中坍塌，点燃并在核心产生重元素。对于质量最大的恒星来说，只需要几百万年，富集的物质就会被炸回星际空间，在那里恒星的形成可以重新开始。被称为仙后座A的不断膨胀的碎片云是恒星生命周期最后阶段的一个例子。产生这一遗迹的超新星爆炸发出的光大约在350年前首次出现在地球的天空中，尽管这些光花了11000年才到达我们这里。这张来自詹姆斯韦伯太空望远镜的NIRCam图像显示了超新星遗迹中仍然炽热的细丝和结。膨胀的爆炸波的白色烟雾状外壳直径约为20光年。在韦伯拍摄的超新星遗迹仙后座a的详细图像中，也发现了这颗大质量恒星灾难性爆炸的光回声。今晚观看：双子座
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Massive stars in our Milky Way Galaxy live spectacular lives. Collapsing from vast cosmic clouds, their nuclear furnaces ignite and create heavy elements in their cores. After only a few million years for the most massive stars, the enriched material is blasted back into interstellar space where star formation can begin anew. The expanding debris cloud known as Cassiopeia A is an example of this final phase of the stellar life cycle. Light from the supernova explosion that created this remnant would have been first seen in planet Earth's sky about 350 years ago, although it took that light 11,000 years to reach us. This sharp NIRCam image from the James Webb Space Telescope shows the still hot filaments and knots in the supernova remnant. The whitish, smoke-like outer shell of the expanding blast wave is about 20 light-years across. Light echoes from the massive star's cataclysmic explosion are also identified in Webb's detailed image of supernova remnant Cassiopeia A. Tonight watch: The Geminids