Elon Musk just revealed a secret message SpaceX sent to space aboard the cosmic Tesla

Elon Musk is always one for a nice surprise. 

Just after SpaceX launched the first flight of its Falcon Heavy rocket on Tuesday, lofting a red Tesla Roadster to deep space, Musk revealed a little secret hidden within the cosmic car. 

Musk posted a photo on Instagram displaying a message for any space-faring civilization that may come across the car in the future. The words “made on Earth by humans” are printed on the Tesla’s circuit board.

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