Around 5.4 billion years from now, the core of the Sun will become hot enough to trigger hydrogen fusion in its surrounding shell.

"You'd have to go direct to hydrogen fusion every time?"

One example is the "magnetic bottle" idea for getting power from hydrogen fusion.

There was no time to identify each city before it vanished forever in the glow of hydrogen fusion.

Such was the case with the idea that hydrogen fusion might occur at moderate temperatures within solid materials.

It would become an impossible one when hydrogen fusion turned the whole world to incandescence.

It has stopped hydrogen fusion in its core, this implies an age much higher than our Sun's 4.5 billion years.

George Gamow proposes hydrogen fusion as the energy source for stars.

"What temperature would be needed to start hydrogen fusion?"

"You say we need a temperature of ten million to start hydrogen fusion?"