The voices of 50 New Zealanders will be sent more than 750,000 kilometres through space and time in a competition to celebrate Doctor Who's 50th anniversary.
The voices will be sent using a method called a moon bounce - a rare method developed by the US military in 1940 which involves bouncing an audio message off the moon's surface to an Earth-based receiver in a matter of seconds.
The method is currently practised by only a niche group of radio astronomy specialists.
One of the specialists has partnered with television channel Prime to launch the competition.
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Depending on the stage of the lunar cycle and the position of the moon, voice messages return back to Earth with varying levels of galactic distortion.
The returned messages will be heard on the website following the close of the competition, and a top few will be selected for use in radio to promote the 50th anniversary special.
The New Zealand television premiere of the 50th anniversary episode of Doctor Who, The Day of the Doctor, will appear on Prime on November 24.
Doctor Who fans can enter their messages via the online Moonbouncer at primetv.doctorwhomoonbouncer.co.nz or by calling 0800 TARDIS until November 13.