Iridium is rare on Earth but common on asteroids ... Chromium, by contrast, is very common on Earth so it could not be correlated to a meteorite impact. Later, scientists found more evidence ...

This comes after Nicola Fox of NASA's science mission directorate said: "Psyche is by far the largest [asteroid], and that's ...

The date corresponds perfectly to the date of the dinosaur extinction. Rare Metal The metal iridium, which is similar to platinum, is very rare on Earth's surface but is more common in asteroids ...

Whatever the origin of meteorite diamonds ... much as the famous iridium layer has done? Scientists won't be able to say without further study, but the idea holds promise. (In the 1998 book ...