The Gods Themselves (SF Masterworks)

In the year 2100, the invention of the Electron Pump - an apparently inexhaustible supply of free energy - has enabled humanity to break free of the Earth and establish a foothold in the wider solar system. But the Electron Pump works by exchanging materials with a parallel universe, and such unbalancing of the cosmos has consequences. Now the race is on to prevent a vast nuclear explosion in the heart of the Sun - and the vaporization of the Earth exactly eight minutes later . . .