What spinning structure forms around a protostar, feeding material onto the central object and later forming planetary building blocks?

Answer

Accretion disk

As matter falls inward onto the protostar, it forms a rotating accretion disk which feeds the central mass and provides the material for future planets, asteroids, and comets.

What spinning structure forms around a protostar, feeding material onto the central object and later forming planetary building blocks?
Spaceastronomyuniversestarsformation