In 1977, NASA sent Voyager 1 and Voyager 2 into space, and each probe continues to explore the far reaches of the galaxy today. NASA included a “golden record” aboard each spacecraft — a gold-plated disc serving as a sort of time capsule in case the probe ever encountered extraterrestrial life. Each record contains 115 images depicting life on Earth, such as people eating and cars stuck in traffic. They also hold audio recordings of naturally occurring sounds such as waves and thunderclaps, as well as spoken greetings in various languages and classical music from different cultures. To ensure longevity, NASA made each record from gold-plated copper mixed with a pure sample of uranium-238, the latter of which has a half-life of 4.468 billion years. The cover of each record was then hand-etched with the inscription, “To the makers of music — all worlds, all times,” along with diagrams instructing how to play the record. |
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