环绕于金牛变星(T Tauri stars) 或大低星 (Herbig stars) 的吸积盘被成为源行星盘(protoplanetary discs)，由于它们被以为是形成止星体系的开山祖师。这种环境下，被吸积的气体来自于恒星造成时的分子云而是伴星。
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protoplanetary discs
原行星盘
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Such an arrangement would have quickly shed its protoplanetary discs, so how exactly the exoplanet came to be formed is a mystery.
ECONOMIST: Planetary science: When a world is born | The
We will be able to look at things like new solar systems in formation and particularly the structure of so-called 'protoplanetary discs, ' where we believe a star is growing in the middle and planets are forming around the outside.
CNN: Telescope set to reveal 'Big Bang'
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