This nebula is a bubble, and it's a bubble because intense blasts of stellar wind and radiation for a nearby star have cut through the dust and hollowed out the middle.
此星云呈泡沫状，之所以如此，是因为附近一颗恒星发生剧烈爆炸，产生的辐射和恒星风从尘埃云中间穿过，掏空了中间部位。
This nebula is a bubble, and it's a bubble because intense blasts of stellar wind and radiation for a nearby star have cut through the dust and hollowed out the middle.
此星云呈泡沫状，之所以如此，是因为附近一颗恒星发生剧烈爆炸，产生的辐射和恒星风从尘埃云中间穿过，掏空了中间部位。
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