The content of the Arecibo message was designed by Frank Drake, then at Cornell University and creator of the Drake equation, who wrote the message with help from Carl Sagan and others. The message was meant merely as a demonstration of human technological achievement, rather than a serious attempt to enter into a conversation with possible extraterrestrials. Because globular cluster M13, at which the message was aimed, is more than 25,000 light-years from Earth, the message, traveling at approximately the speed of light, will take at least 25,000 years to arrive there. By that time, the core of M13 will no longer be in precisely the same location because of the orbit of the star cluster around the galactic center. Even so, the proper motion of M13 is small, so the message will still arrive near the center of the cluster.