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How big is 眨眼星云?
4.5 trillion kilometers!
Blinking Nebula 是个行星状星云但它实际上不会眨眼. 它只是会从视线中忽隐忽现. 而在 这星云的两端各有一个红色的"快速低电流辐射区" (FLIERs, Fast Low-Ionization Emission Regions).
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