Sentences with phrase «sustained nuclear fusion reactions»

For decades scientists have sought to generate clean energy by instigating the kind of sustained nuclear fusion reactions that power the sun.

Some MACHOs may be neutron stars left behind after supernovae explosions, but most are thought to be tiny failed stars called brown dwarfs which have a mass of less than 8 per cent that of the Sun and are too small to sustain nuclear fusion reactions.

Although they are as common as stars and form in much the same way, brown dwarfs lack the mass necessary to sustain nuclear fusion reactions.