Question

which of the processes can initiate the collapse of an interstellar cloud and trigger the formation of stars? heating of gas caused by nuclear fission high - redshift gamma ray bursts collision with another cloud formation of planets

Explanation:

Nuclear fission is not relevant as it occurs in stars already formed. High - redshift gamma - ray bursts are not related to initial cloud collapse. Planet formation comes after star formation. A collision with another cloud can increase density and gravitational force, initiating cloud collapse for star formation.

Answer:

collision with another cloud