Imagine a substance that acts as a metal, conducts electricity with zero resistance, and is powerful enough to be the ultimate rocket fuel. This is metallic hydrogen, a "lost" phase of matter first predicted back in 1935. On Earth, hydrogen is a gas. But under the staggering pressures found in the hearts of Jupiter and Saturn—millions of times the atmospheric pressure of Earth—hydrogen molecules are squeezed so tightly that they break apart. The electrons become "delocalized," allowing them to f

Making hydrogen a metal takes lot of pressure. But after a group of scientist’s lost the world’s first sample, the pressure is really on. (via Elements) | Seeker Media