Astronomy
The Role of Dust Grains in Planet Formation
Quick fact
A single dust grain in a protoplanetary disk is about a micrometer across—similar to smoke particles—yet trillions of these grains collectively build planets hundreds of kilometers wide.
Why this is interesting
You're made of stardust, but before that, you were made of dust grains smaller than a grain of salt. How does something that tiny become an entire world?