水螅( hydra的名词复数 );难于根除的祸患;九头蛇;难以根除的祸害,水螅;
that is, tw hydrae formed much more recently than our sun but is past the point at which most fledgling stars are still encircled by a massive disk of dust and gas-the stuff of planet formation.
也就是说,长蛇座TW的形成晚于太阳,但却早于大多数初出茅庐的新星,那些新星周围仍然环绕着大量星尘和气团,而它们则是最初形成行星的材料。
Such is the case for a nearby star called TW Hydrae.
一颗被称作长蛇座TW的邻近恒星也属于这类情况。
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