Researchers at Harvard have provided the first experimental demonstration of solid metallic hydrogen. At very high pressures, dihydrogen (H2) is converted to a solid with the properties of an atomic metal, including being reflective.

A popular press summary: https://phys.org/news/2017-01-metallic-hydrogen-theory-reality.html

The original research report in Science magazine: http://science.sciencemag.org/content/early/2017/01/25/science.aal1579/tab-pdf

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