Planetary nebulae are a type of isolated gaseous nebulae possessing a fair degree of bilateral symmetry.

行星状星云是一类孤立的气体星云,具有相当程度的双侧对称性.

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Planetary nebulae fade away gradually over tens of thousands of years.

行星状星云在数万年间逐渐衰老.

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Planetary nebulae are not as airy and tranquil as their images suggest.

行星状星云并不如影像中所显现的那麽飘逸宁静.

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Tne binary interactions play an important role in the formation and shaping of planetary nebulae ( PNe ).

在行星状星云形成过程中 双星 起着非常重要的作用.

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