5.7_Exit Ticket

Put the following sequence of events in the correct order. You may use the attached diagram for help.

1. A cloud of gas (nebula) forms
2. The center of the nebula grows so dense that fusion occurs, forming a protostar
3. Protoplanets condense and differentiate into fully developed planets
4. Protoplanets form on the edges of the accretion disk, denser rocky planets closer to the middle, lighter gas planets on the outside
5. The nebula grows denser at the center, condensing into an accretion disk