5.7_Exit Ticket

The nebula grows denser at the center, condensing into an accretion disk

Protoplanets form on the edges of the accretion disk, denser rocky planets closer to the middle, lighter gas planets on the outside

The center of the nebula grows so dense that fusion occurs, forming a protostar

A cloud of gas (nebula) forms

Protoplanets condense and differentiate into fully developed planets