NGC 4414：一个絮状螺旋星系
(原标题: NGC 4414: A Flocculent Spiral Galaxy)
2025-04-07
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絮状螺旋隐藏了多少质量？这张絮状螺旋星系NGC 4414的特色图像是由哈勃太空望远镜拍摄的，以帮助回答这个问题。絮状螺旋星系——没有明确旋臂的星系——是相当常见的星系形式，ngc4414是最接近的星系之一。螺旋星系可见边缘附近的恒星和气体绕中心旋转的速度如此之快，以至于来自大量看不见的暗物质的引力必须存在才能将它们聚集在一起。了解NGC 4414的物质和暗物质分布有助于人类校准星系的其余部分，并通过推断，一般的絮状螺旋。此外，校准到NGC 4414的距离有助于人类校准整个可见宇宙的宇宙距离尺度。
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How much mass do flocculent spirals hide? The featured image of flocculent spiral galaxy NGC 4414 was taken with the Hubble Space Telescope to help answer this question. Flocculent spirals -- galaxies without well-defined spiral arms -- are a quite common form of galaxy, and NGC 4414 is one of the closest. Stars and gas near the visible edge of spiral galaxies orbit the center so fast that the gravity from a large amount of unseen dark matter must be present to hold them together. Understanding the matter and dark matter distribution of NGC 4414 helps humanity calibrate the rest of the galaxy and, by deduction, flocculent spirals in general. Further, calibrating the distance to NGC 4414 helps humanity calibrate the cosmological distance scale of the entire visible universe.