It would be hard enough these days to find a human capable of playing a 12-inch LP, let alone an alien. So perhaps it is time for Nasa to update its welcome pack for extraterrestrials.
The agency announced earlier this month that its Voyager 1 probe has left the solar system, becoming the first object to enter interstellar space. On board is a gold-plated record from 1977.
It contains greetings in dozens of languages, sounds such as morse code, a tractor, a kiss, music – from Bach to Chuck Berry – and pictures of life on Earth, including a sperm fertilising an egg, athletes, and the Sydney Opera House.
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