Metals — mostly iron with a bit of nickel — fell toward the center to form a core. The growing core also vacuumed up other metallic elements, such as platinum, iridium and gold. By the time ...

In other words, the outer core is less dense than it should be, suggesting there's some non-iron element mixed in, making it lighter. So that raises the question: Why would the lighter element be ...

Nuclei with varying numbers of neutrons are called isotopes of an element. So, isotopes of iron include iron-54 with ... "I like to draw the analogy of taking a journey. We've been looking forward ...

Iron is the main ingredient in various forms of iron and steel, but the various types of metals contain other elements as well. Sometimes these elements are unwanted; other times they're ...