Drake Equation Understanding the Terms: percent of these appropriate stars that have planetary systems   back to full equation What percent of appropriate stars actually have planetary systems? We have only just begun to be able to detect extra-solar planets, and even now, we are limited to finding very massive planets around nearby stars. Thus, we don't really know how common they are, and estimates range anywhere from 1% to 100%. What pecentage of stars will develop planetary systems? select one most stars some stars few stars Your current choice for this term: To update this value, return to the full equation page and change the value in the form.   previous term in equation  |  full equation  |  next term in equation