This undated image provided by the Lawrence Livermore National Laboratory shows a cylindrical hohlraum container about 0.4 inches tall containing a deuterium and tritium capsule, held by cryogenically-cooled positioning arms. In research reported Wednesday, Feb. 12, 2014 by the journal Nature, scientists say they've taken a key step toward harnessing nuclear fusion as a new way to generate power, an idea that has been pursued for decades. In tests, 192 laser beams briefly fired into the small gold cylinder which held the two kinds of hydrogen. The energy from the lasers kicked off a process that compressed the ball by an amount akin to squeezing a basketball down to the size of a pea, said Debbie Callahan, an author of the paper. That created the extremely high pressure and temperatures needed to get the hydrogen atoms to fuse. (AP Photo/Lawrence Livermore National Laboratory, Eddie Dewald)
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