Galileo asserted that the Earth was not the center of the universe. Kepler established the motion of heavenly bodies which is how we are able to find worlds hidden from view. Sagan allowed us to consider that aliens may not just be the stuff of fantasy. Drake provided a way for us to guess how many we might expect to find. Tarter wanted to hear from them and founded the SETI Institute.
Tee also includes the two-color SETI brand ID on back.