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哈勃本周照片——NGC 4900,NGC 4536
这是位于“室女座”方向约4500万光年外的螺旋星系“NGC 4900”。其明亮的中心部分被宽阔且边界模糊的旋臂(螺旋臂)所环绕。在旋涡星系中,中心膨胀部分被称为星系核球,而有旋臂的部分则被称为星系盘。NGC ...
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