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 spoke features seem to indicate that the Helix Nebula is itself an old and evolved planetary nebula.
辐射线的特征似乎说明了螺旋状星云本身的古老；历经了行星状星云的演化过程。
The spoke features seem to indicate that the Helix Nebula is itself an old and evolved planetary nebula.
辐射线的特征似乎说明了螺旋状星云本身的古老；历经了行星状星云的演化过程。
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