According to the U.S. Department of the Interior, iridium in the Earth’s crust is thought to have come from the same asteroid or comet believed to have caused the extinction of dinosaurs. While ...

Some security experts are worried that a cache of radioactive material reportedly stolen from an oil field in Iraq could be used by organizations such as the Islamic State group to produce a dirty ...

This week's element is iridium, which has the atomic number 77, and the symbol Ir. Iridium is a silvery-white metal that is very hard and brittle. It also has a very high melting point, making it ...

Appearance: Platinum-coloured, but with a slight yellowish cast. What is it? A radioactive isotope of the element iridium, which emits beta and gamma radiation as it decays. Is it in the ground?

One of the ways that we know when and where comets came crashing into Earth is by checking the ground for iridium. Although this platinum-colored metal is common in space, Earth’s supply of iridium ...