You’re might be right. From a website called “LiveScience” I have ... “Under the liquid-metal outer layer of the Earth’s core is a solid ball of superhot iron and nickel alloy about 760 miles (1,220 kilometers) in diameter. Scientists recently discovered the inner core is, at 10,800 degrees Fahrenheit (6,000 degrees Celsius), as hot as the surface of the sun.”
Al Gore told us that the core is millions of degrees.
Nickel-iron? Maybe. Id’ venture that the really dense stuff crowds it out.
I’m going with a gold-tungsten-uranium core...