Earth's inner core is solid and blistering hot. For decades, scientists have known the inner core is solid thanks to the pioneering work of Danish seismologist Inge Lehmann, who first proposed its ...

Add Yahoo as a preferred source to see more of our stories on Google. Scientists have long thought Earth's inner core is like a huge solid metal ball. But an experiment revealed it may be a lot softer ...

Scientists have long thought Earth's inner core is like a huge solid metal ball. But an experiment revealed it may be a lot softer — more like butter, a lead scientist said. It could help explain why ...