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.

Prof Michio Kaku on the science behind UFOs and time travel - Telegraph

A Brief History Of Time Machines - Forbes.com
The dream of time traveling, to the past or future, is probably as old as the human imagination. When H.G. Wells published The Time Machine in 1895, he called it a “scientific romance” because no one knew whether time travel was possible.