Iron meteorites suggest early solar system was doughnut-shaped

Roughly four billion years ago, our solar system formed out of a cloud of gas and dust swirling around the sun. Scientists have long wondered about the structure of this protoplanetary disc, a planetary nursery, that formed our solar system. While astronomers can observe distant protoplanetary disks, these come in many shapes and sizes, meaning it’s impossible to know exactly what ours looked like. That is, unless you were viewing it from billions of light years away. Now, scientists believe …