因此，它的大气层由重量很轻的元素：氢和氦构成。
So, it has an atmosphere of light-weight elements: hydrogen and helium.
然而在外部区域，太阳风变得十分温和，使得由氢和氦构成气态巨行星得以存在。
The solar wind was much weaker in the outer regions, however, resulting in gas giants made up mostly of hydrogen and helium.
它主要由电离氢分子和氦构成，同时还包括碳、氧、氮和其他原子，使得其呈现纷繁的混合色彩。
It is mostly made of ionized hydrogen and helium, though carbon, oxygen, nitrogen and other atoms are present, producing the complex color blend visible here.
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