Our solar system didn't always look like the familiar flat plane of planets we see today.
Billions of years ago, it resembled a donut, with heavier metals like iridium and platinum spreading outwards as the disk expanded.
This donut shape allowed these metals to move further out, eventually becoming part of asteroids in the outer solar system.
Scientists have made this discovery by studying iron meteorites, which provide clues about the early stages of our solar system's formation.
