400年前，约翰·开普勒发现太阳风作用形成彗尾的现象，并由此提出星际航行的构想，但这常被认为是科幻小说里的内容。
Often considered the stuff of science fiction, sailing through space was suggested 400 years ago by astronomer Johannes Kepler who observed comet tails blown by the solar wind.
科幻小说的一个重要作用，是要表明某种人类行动会产生什么种类的未来。
One vital role of science fiction is to show what kinds of future might result from certain kinds of human actions.
然而，科幻小说在现代社会所起作用最重要的方面，也许可以用一个词来贴切地加以概括：变化。
Perhaps, however, the most important aspect of science fiction's role in the modern world is best summed up in a single word: change.
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