brown dwarf

基本解释

Brown dwarfs are balls of gas whose mass is generally dozens of times that of Jupiter.
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 warm gas that lack the mass necessary to fuse hydrogen at their core, as stars can.
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。
Since there is a higher chance of such close encounters in dense star clusters, we might expect to detect more brown dwarfs there, he says.
他还说，既然在稠密的星簇里，近距离接触产生的机会比较高，由此我们可以期待着检测到更多的棕矮星。

MACHOs could well be white dwarfs--overturning a common belief that the dark matter would consist mainly of lighter interstellar garbage such as brown dwarfs.
ECONOMIST: The dark side of cosmology
The first kind, the chunks, could be anything in size from dust grains, up through rocks and asteroids, to brown dwarfs (condensed lumps of gas not quite heavy enough to be stars).
ECONOMIST: The dark side of cosmology
The problem is that brown dwarfs have been discovered orbiting other stars, and it is thought that planets can sometimes be ejected from their natal solar systems as a result of gravitational interactions, and may thus be found drifting in space.
ECONOMIST: Twinkle, twinkle, giant planet