The space probe, Voyager I, launched in 1977, had sent back spectacular images of Jupiter and Saturn and then soared out of the Solar System on a one-way mission to the stars.

1977年发射的“旅行者一号”太空探测器发回了木星和土星的壮观图像，然后飞出太阳系，执行前往恒星的单程任务。

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By contrast, Voyager 1, the most distant functioning space probe, is using an extremely weak transmitter to beam radio messages back to earth across 10 billion miles of space.

与此形成鲜明对比的是，最遥远的旅行者1号太空飞船在飞出100多亿公里之外，还能利用极其微弱的发射器将无线电信号传回地球。

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Voyager 2 has proved to be the most successful space probe ever launched.

“旅行者2号”被证明是所曾发射的最成功的宇宙探测器。

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On August 20, 1977, the U.S. National Aeronautics and Space Administration launched the Voyager space probe from Cape Canaveral, Florida.

FORBES: The Trillion Mile-Per-Gallon Engine

It would be an understatement to say there's been a long build-up to the moment when Voyager 1 ventures into interstellar space: scientists thought the probe was on the edge back in 2010, and we've been waiting for the official milestone ever since.

ENGADGET: AGU study says Voyager 1 has reached interstellar space, but NASA remains skeptical