To form a nebula,

Question

gravity
pulls matter together or causes
pressure change
.

Answer 1

To form a nebula, gravity plays a significant role by pulling matter together. As gravity attracts gas and dust in space, the density of this material increases, leading to regions of higher concentration. Additionally, as matter is pulled together, it can cause pressure changes within these regions. The interplay between gravity and these pressure changes can lead to the formation of new stars and planetary systems within the nebula. Overall, gravity is the primary force driving the formation of nebulae, while pressure changes are a result of the gravitational collapse and interactions within the material.