 And so in 1926, Mars was in opposition to Earth, which means it was at its closest point in its orbit, about 35 million miles. So he decided to try to send a telegram to the Martians. He worked this out with Uma Ruru, that their Martian scientists would be ready to receive the message from Earth. And so he worked with the Rugby Radio Tower in London, which was the world's tallest, most powerful radio tower in the world at that time. And they were connected with the post office.