Humans have always depended on energy from the sun, though it was exploited mostly indirectly for thousands of years.
人类一向依靠阳光能源，不过几千来主要为间接利用。
The solar wind from the sun was so powerful that it swept away most of the lighter elements, such as hydrogen and helium, from the innermost planets, leaving behind mostly small, rocky worlds.
来自太阳的太阳风以其强大的力量吹走了内行星上的氢和氦一类的轻元素，只留下了更小的石质星球。
This could be because they're born of debris from a dormant comet and so are made mostly of hard, sun-baked rock that takes longer to burn up in Earth's atmosphere, experts suggest.
这可能是因为他们出生的碎片从休眠状态，因此彗星是由硬，艳阳高照的岩石燃烧时间较长，在地球大气层主要是，专家建议。
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