Patenet's answer to questions about evidence of life beyond Earth was sure to inflame the suspicions of those convinced the government is holding back: "We do not have the least proof that extra-terrestrials are behind the unexplained phenomena."
But then he added: "Nor do we have the least proof that they aren't."
The CNES fields between 50 and 100 UFO reports ever year, usually written up by police. Of these, 10 percent are the object of on-site investigations, Patenet said.
Other countries collect data more or less systematically about unidentified flying objects, notably in Britain and in the United States, where information can be requested on a case-by-case basis under the Freedom of Information Act.
"But we decided to do it the other way around and made everything available to the public," Patenet said.
The aim was to make it easier for scientists and other UFO buffs to access the data for research.
The Web site itself — which crashed host servers hours after it was unveiled due to heavy traffic — is extremely well organized and complete, even including scanned copies of police reports.