(单词翻译:单击)
A brown dwarf is a type of celestial object that can’t be classified as a planet or a star.
褐矮星是一种天体，但它不能被归类为行星或恒星。
Although brown dwarfs look more like planets, they form the same way stars do.
虽然褐矮星看起来更像行星，但它们的形成方式与恒星相同。
A star is created when a cloud of gas and dust begins to compress.
当气体云和尘埃云开始收缩时，恒星就产生了。
The intense force of gravity causes the star’s core to fuse atoms together, producing helium.
强烈的引力使恒星的核心将原子融合在一起，并产生氦。
Fusion is what causes a star to shine.
聚变是恒星发光的原因。
Early in its life, a star fuses atoms of deuterium.
在恒星生命的早期会发生氘原子聚变。
It begins to use regular hydrogen as its core gets hotter.
随着核心温度的升高，氢原子聚变就开始了。
However, brown dwarfs never reach this stage.
然而，褐矮星从未达到这一阶段。
They stay at low temperatures and fuse deuterium until they run out.
它们在低温下熔化氘，直到耗尽。
Brown dwarfs produce very little light, which makes them hard to find.
褐矮星发出的光很微弱，这使得它们很难被发现。
Scientists first theorized about brown dwarfs in 1963, but didn’t observe any until 1995.
科学家在1963年首次提出了有关褐矮星的理论，但直到1995年才观测到褐矮星。
