Apparently, the sounds we've been receiving from the Voyager 2 probe have changed drastically. This is the sound that scientists have been getting back.

A German scientist named Hartwig Hausdorf* thinks the sound is significant because it is first contact with an alien culture:

"It seems almost as if someone has reprogrammed or hijacked the probe," he told German newspaper Bild. "Thus perhaps we do not yet know the whole truth."

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Nasa's explanation is rather more prosaic. It blames a software problem with the craft's flight data system. Voyager 2 has been given instructions to transmit only information about its own status while scientists try to get to the bottom of the mystery.

* Not related to aliens or NASA, but Hartwig Hausdorf should have been Jerry Lewis's name in The Day the Clown Cried.