Question

ASTRONOMY

Once a disk forms around a star, the process of planetary formation can begin. Rank the evolutionary stages for the formation of planets from earliest to latest.

Rank from earliest to latest. To rank items as equivalent, overlap them.

Small clumps of matter stick together via the process of accrection to form plantesimals a few hundred kilometers in diameter

Dust keeps matter inside the disk cool long enough for planet formation to start

Planetisimals begin to accrete, forming protoplanets

Dust grains form condensation nuclei on which surrounding atoms condense to form small clumps of matter

A collection of a few planet-sized protoplanets remain in a fairly cleared out disk around the star

Answer 1