In 1975, Sturrock did a more comprehensive survey of members of the American Astronomical Society. Of some 2600 questionnaires, over 1300 were returned. Only two members offered to waive anonymity, and Sturrock noted that the UFO subject was obviously a very sensitive one for most colleagues. Nonetheless, Sturrock found a strong majority favored continued scientific studies, and over 80% offered to help if they could. Sturrock commented that the AAS members seemed more open to the question than the AIAA members in his previous survey. As in the AIAA survey, about 5% reported puzzling sightings, but skepticism against the Extraterrestrial Hypothesis (ETH) ran high. Most thought that UFO reports could ultimately be explained conventionally. Sturrock also found that skepticism and opposition to further study was correlated with lack of knowledge and study: only 29% of those who had spent less than an hour reading about the subject favored further study versus 68% who had spent over 300 hours.