First hour guest Seth Shostak, senior astronomer at SETI, vigorously refuted Steven Greer's claims that SETI has been receiving multiple ET signals.

If SETI had run across anomalous signals they would alert other astronomers for verification, he said, adding that if such a find was made, it would be a major discovery, not a security issue to be covered up.

Further, he noted that Greer presented no facts, names, dates, frequencies or technical data.