Solar Nebula Theory
Core Accretion Model
Disk Instability Model
100

Area containing gas and dust and surrounding a newly-formed protostar

protoplanetary disk

100

A protoplanet can become a gas giant if it grows beyond roughly 10 Earth masses before the protoplanetary gas disperses. About how long is this gas typically available?

2–3 million years

100

Where in the protoplanetary disk does the disk instability model typically occur, relative to the central star?

far from the host star, on the outskirts

200

This event potentially triggers the collapse of a gas cloud, leading to star and planet formation

supernova explosion

200

After reaching about 100 km, which growth phase dominates?

Oligarchic growth

200

In the disk instability model, what are the large, self-gravitating bodies formed directly from disk material called?

clumps