Nuclei with varying numbers of neutrons are called isotopes of an element. So, isotopes of iron include iron-54 with 26 protons and 28 neutrons, ... "I like to draw the analogy of taking a journey.

"If the core was pure iron, the density contrast between the solid inner core and the liquid [outer core] should be on the order of 1.5 percent," he said. "But seismology tells us it's more like 5 ...

Astronomers studying the pair have discovered the heaviest element ever found in an exoplanet atmosphere, which is several times heavier than iron and suggests these ultra-hot Jupiter-like ...

The research team ruled out other elements, like silicon, that might theoretically be present in the core based on the makeup of that cloud but don't explain the observed effect. Oxygen was left ...