It hasn't been confirmed yet[0]. Their evidence so far is that they saw something shiny in the diamond anvil. The shiny thing may not necessarily be metallic hy

It hasn't been confirmed yet[0]. Their evidence so far is that they saw something shiny in the diamond anvil. The shiny thing may not necessarily be metallic hydrogen, and could just be the coating. There are also questions that they reached as high of a pressure as they said they did. Metallic hydrogen has been created in the lab before. Of course, in these previous cases the metallic hydrogen didn't last long(neither did the test apparatus) as the necessary pressures were reached using explosions. The first confirmed production of metallic hydrogen used a giant gun to shoot a large bullet at a small container of liquid hydrogen at ~7 kilometers per second.[1] One unconfirmed attempt even used a specially designed bomb to compress liquid hydrogen[2]. [0]http://www.nature.com/news/physicists-doubt-bold-report-of-metallic-hydrogen-1.21379 http://www.nature.com/news/physicists-doubt-bold-report-of-m... [1]https://en.wikipedia.org/wiki/Metallic_hydrogen#Shock-wave_compression.2C_1996 https://en.wikipedia.org/wiki/Metallic_hydrogen#Shock-wave_c... [2]http://web.archive.org/web/20120321111752/http://lateralscience.co.uk/Hmetal/index.html http://web.archive.org/web/20120321111752/http://lateralscie...