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 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 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。
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