M100：一个大设计螺旋星系
(原标题: M100: A Grand Design Spiral Galaxy)
2023-04-08
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在真正的宇宙尺度上，M100被称为一个宏伟的螺旋星系。它是一个由超过1000亿颗恒星组成的大星系，有着明确的旋臂，与我们的银河系类似。M100（别名NGC 4321）是室女座星系团中最明亮的成员之一，距离白姑娘座的发座（白姑娘座后发座）5600万光年。这张哈勃太空望远镜拍摄的M100图像是用广角相机3拍摄的，突出了明亮的蓝色星团和复杂蜿蜒的尘埃带，这些都是这类星系的标志。对M100中变星的研究在确定宇宙的大小和年龄方面发挥了重要作用。
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Majestic on a truly cosmic scale, M100 is appropriately known as a grand design spiral galaxy. It is a large galaxy of over 100 billion stars with well-defined spiral arms that is similar to our own Milky Way Galaxy. One of the brightest members of the Virgo Cluster of galaxies, M100 (alias NGC 4321) is 56 million light-years distant toward the constellation of Berenice's Hair (Coma Berenices). This Hubble Space Telescope image of M100 was taken with the Wide Field Camera 3 and accentuates bright blue star clusters and intricate winding dust lanes which are hallmarks of this class of galaxies. Studies of variable stars in M100 have played an important role in determining the size and age of the Universe.