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Originally Posted by Augi
Only this one:
It is theorized that hydrogen becomes metallic at high enough temperatures. It has never been proven--so says the chemistry text.
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Actually, identifiable metallic hydrogen was produced in a laboratory setting for the first time in 1996, at Lawrence Livermore National Laboratory. It required pressure in excess of one million atmospheres and lasted about a microsecond. The results of that experiment have led scientist to theorize that there is actually more metallic hydrogen at the core of gas giant planets than previously suspected.