Mysterious 'Dark Hydrogen' May Lurk Within Giant Planets

Exotic "dark hydrogen" lurks within giant planets such as Saturn and Jupiter, a new study suggests. "This dark hydrogen layer was unexpected and inconsistent with what modeling research had led us to believe about the change from hydrogen gas to metallic hydrogen inside of celestial objects," co-author Alexander Goncharov, a physicist at the Carnegie Institution for Science in Washington, D.C., said in a statement.