2025年1月27日
Pleiades over Half Dome
Image Credit & Copyright: Dheera Venkatraman
Explanation: Stars come in bunches. The most famous bunch of stars on the sky is the Pleiades, a bright cluster that can be easily seen with the unaided eye. The Pleiades lies only about 450 light years away, formed about 100 million years ago, and will likely last about another 250 million years. Our Sun was likely born in a star cluster, but now, being about 4.5 billion years old, its stellar birth companions have long since dispersed. The Pleiades star cluster is pictured over Half Dome, a famous rock structure in Yosemite National Park in California, USA. The featured image is a composite of 28 foreground exposures and 174 images of the stellar background, all taken from the same location and by the same camera on the same night in October 2019. After calculating the timing of a future juxtaposition of the Pleiades and Half Dome, the astrophotographer was unexpectedly rewarded by an electrical blackout, making the background sky unusually dark.
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Tomorrow’s picture: big comet
半圆丘上空的昴宿星团
影像提供与版权: Dheera Venkatraman
说明: 恒星会抱团。地球天空中最著名的恒星抱团是昴宿星团，一个肉眼轻易可见的明亮星团。昴宿星团近在450光年之处，大约形成于1亿年前，而恒星形成活动可能还会再持续约2.5亿年。太阳当初很可能也是诞生于星团里，但如今已45亿年高龄的太阳，其星团同胞早已分道扬镳。在上图里，昴宿星团悬在美国 加利福尼亚州优胜美地国家公园著名巨岩半圆丘的上方。这幅摄于2019年10月的主题影像，是由位在相同地点、相同相机在同一晚所拍摄的28张前景照片和174张背景恒星照片组合而成。在精算好昴宿星团和半圆丘并排的时间之后，这位个天文摄影者还因当地停电而获得意外的奖赏，因为背景天空变得格外的幽暗。
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明日的图片: big comet
