The Double Helix Nebula is a gaseous nebula near the center of our galaxy.
双螺旋星云是一个气态星云，靠近银河系中心。
The double black holes were found in a bright, highly active galaxy known as NGC6240, about 400 million light-years from the Earth.
这对黑洞存在于一个极其活跃明亮的星系中，该星系被命名为NGC6240，它距地球约有4亿光年。
The double black holes were found in a bright, highly active galaxy known as NGC6240, about 400 million light-years from the Earth.
这对黑洞存在于一个极其活跃明亮的星系中，该星系被命名为NGC6240，它距地球约有4亿光年。
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