这些夭折恒星(指棕矮星)的起源是个谜。

The origin of these failed stars is a mystery.

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棕矮星是一种气体球，它们的质量仅是木星的几十倍。

Brown dwarfs are balls of gas whose mass is generally dozens of times that of Jupiter.

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棕矮星是一些由炽热的气体组成的球，它们缺乏像行星那样足够的质量来进行氢的燃烧。

Brown dwarfs are balls of warm gas that lack the mass necessary to fuse hydrogen at their core, as stars can.

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