How do debris disks and planet-forming disks differ?
A)Debris disks have higher density than planet-forming disks.
B)Debris disks contain larger amounts of gas than planet-forming disks.
C)Debris disks are found around older stars than those with planet-forming disks.
D)Only debris disks are expected to be affected by the gravity of planets within them.

Question

Quizplus · Accepted Answer

Debris disks are often found around older stars that have already formed planets, whereas planet-forming disks are found around younger stars that are still in the process of forming planets. Debris disks are also composed mainly of smaller, rocky or icy debris left over from planet formation, while planet-forming disks contain gas and dust that can clump together to form larger planetesimals. Choice A and B are incorrect, as debris disks typically have lower density and less gas than planet-forming disks. Choice D is partially correct, as planets can affect the structure of debris disks, but they can also affect the formation of planets within planet-forming disks.

How Do Debris Disks and Planet-Forming Disks Differ