N a cloud of interstellar gas and dust that gradually collapses, forming a hot dense core, and evolves into a star once nuclear fusion can occur in the core 原恒星
The conditions in a proto star resemble far more closely in situation in red giants most of whose volume is caught up in stormy convection.
原恒星的条件更加类似于红巨星的情形，红巨星体积的大部分都卷入剧烈的对流中。
A star might not gobble a Jupiter whole when it moves close enough, but it could surely swallow a canapé like proto-Earth.
即便离得足够近，恒星也无法整口吞下木星大的行星，但它要吞下地球这么大的行星肯定是小菜一碟。
When a massive proto-star approaches the main sequence, its surface temperature is low and it can not ionize the ambient gas.
当一个大质量原星接近主星序时，它的表面温度是低的，因而不能电离周围的气体。
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