Is there anybody out there? What would you say if you could send a message into space? Would you say hello, ask the meaning of life, share an insight or just complain about the weather?
In celebration of SETI's 50th anniversary 5000 messages will be sent off in to space in the hope of being picked up by aliens.
The event is being organised by Penguin UK and National Science and Engineering Week, the messages of up to 40 words will be fired up using a radio telescope and can contain anything including greetings, confessions or warnings
Go here and write your message