Prof Michio Kaku on the science behind UFOs and time travel

In 1600, the former Dominican monk and philosopher Giordano Bruno was burnt alive in the streets of Rome. To humiliate him, the Church first hung him upside down and stripped him naked. What made the teachings of Bruno so dangerous? He had asked a simple question: is there life in outer space? Rather than entertain the possibility of billions of saints, popes, churches, and Jesus Christs in outer space, it was more convenient for the Church simply to burn him.

telegraph.co.uk