The critical question psychologists will address is whether details of an impending impact should be kept secret, to avoid widespread panic. In December 2004, for example, scientists calculated that if Apophis were to hit it would land somewhere along a line that crossed central Europe, parts of the Middle East, the most populated district on Earth (the Ganges River valley), and on out across the Philippines. At the time, the information was kept secret and many NEO scientists agreed it was the right thing to do.
But Clark Chapman, a planetary scientist at the Southwest Research Institute in Boulder, Colorado, says secrecy goes against the advice of many experts in risk management. "There are myths about the downsides of putting all information out, used as rationalisations by astronomers and space agency officials for withholding information, but which are counter to the policies of expert social scientists."
http://www.guardian.co.uk/frontpage/story/0,,2028208,00.html
