EXPLAINER: Why fusion could be a clean-energy breakthrough

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EXPLAINER: Why fusion could be a clean-energy breakthrough
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The Department of Energy will announce a “major scientific breakthrough” in researchers' attempts to develop the methods of harnessing energy from nuclear fusion on Tuesday. Here's a look at exactly what nuclear fusion is.

In this 2012 image provided by Lawrence Livermore National Laboratory, a technician reviews an optic inside the preamplifier support structure at the Lawrence Livermore National Laboratory in Livermore, Calif. Officials at the Department of Energy say on Tuesday, Dec. 13, 2022, there will be an announcement of a “major scientific breakthrough” on nuclear fusion.

In this 2012 image provided by Lawrence Livermore National Laboratory, a technician reviews an optic inside the preamplifier support structure at the Lawrence Livermore National Laboratory in Livermore, Calif. Officials at the Department of Energy say on Tuesday, Dec. 13, 2022, there will be an announcement of a “major scientific breakthrough” on nuclear fusion.

The Department of Energy is planning an announcement Tuesday about a “major scientific breakthrough” at the Lawrence Livermore National Laboratory, one of several sites worldwide where researchersIt’s a technology that has the potential to one day accelerate the planet’s shift away from fossil fuels, which are the major contributors to climate change. The technology has long struggled with daunting challenges.

Here’s a look at exactly what nuclear fusion is, and some of the difficulties in turning it into the cheap and carbon-free energy source that scientists believe it can be.Look up, and it’s happening right above you — nuclear fusion reactions power the sun and other stars. The reaction happens when two light nuclei merge to form a single heavier nucleus. Because the total mass of that single nucleus is less than the mass of the two original nuclei, the leftover mass is energy that is released in the process, according to the Department of Energy.In the case of the sun, its intense heat — millions of degrees Celsius — and the pressure exerted by its gravity allow atoms that would otherwise repel each other to fuse.

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