While Tryon was the first person to say that our universe was a quantum fluctuation of the vacuum, the German physicist Pascual Jordan was the first person to talk about how a star might be created from the vacuum by a quantum transition. In the 1930s a number of physicists were looking at how to explain where matter was coming from if we lived in a continuous universe (an eternal one, always here). Jordan knew how a sun's mass positive energy could cancel out its gravitational negative energy, leaving a sun with zero energy. This led him to speculate what would prevent a quantum transition from the vacuum from creating a new sun. Jordan was not suggesting that our universe could have come about by a quantum fluctuation of the vacuum, but how matter might be generated if we existed in an eternal universe.