What is Accretion of matter?

Accretion of matter is when tiny bits of stuff slowly come together to make something bigger.

Imagine you're at the beach, and you have a small pile of sand. Every now and then, another grain of sand falls onto it, maybe from your hand, or the wind, or someone else’s foot. Over time, that little pile gets bigger and bigger, until it becomes a big hill of sand. That's accretion in action!

Think of accretion like building with Legos. You start with one piece, maybe a red brick. Then you add another piece on top of it. Then another. And another. Each piece is small, but when they all come together, you make something big and cool, like a castle or a spaceship.

This happens in space too! Tiny pieces of matter, like dust or rocks, slowly join together, forming bigger things like planets or stars. It's not magic, just lots of little bits coming together over time.