I think it would like most things become a very mixed reaction in the populace. On one side people would finely come to terms if they are on the edge about their beliefs or if they believed in Extraterrestrial Life they would be reassured and lead into a better age of enlightenment. However for those who are strong held creationist I fear this kind of event would likely trigged denial and at the worst conflict. Some people would likely be so caught up in their own beliefs that they wouldn't even accept the reality in front of them.