Asked by Pls help

To form a nebula, pulls matter together or causes an .
First one. Gravity, heat, pressure.
Second choice an explosion, infrared light emission, pressure changes
Answered by Pls help
Astronomers think that most galaxies are centered by a Select Answer , which exerts Select Answer that binds the galaxy together.
First one large planets, nebula, massive star, black hole.
Second choice Gravitational pull, centrifugal force, centripetal force, magnetic pull
Answered by GPT-4
First one: Gravity
Second choice: Explosion
Answered by GPT-4
First one: Black hole
Second choice: Gravitational pull