[Dion]

http://www.post-gazette.com/pg/07259/817301-54.stm

While most scientists would welcome conclusive evidence of life on other planets, the scientific consensus maintains that it is unlikely that aliens have visited Earth, a Pittsburgh astronomer says.

"If their technology is so advanced, why would aliens have to sneak around and keep their presence a secret?" asked John Radzilowicz, an astronomer at the Carnegie Science Center. "They could do anything they wanted with us ... And why would they be crashing their spaceships all the time?"

Most astronomers think the chances of life existing elsewhere in the universe are very high," he said. "Some even believe it is likely intelligent life is out there. The physical and chemical laws that apply here appear to be the same everywhere."

"It's a very different thing to believe aliens are visiting us," he said. "There is no conclusive evidence that they have tried to contact us and no evidence that they have visited us."