Which of the following are likely to play a role in determining whether a galaxy is spiral or elliptical?
- the rotation rate of the protogalactic cloud from which the galaxy was born.
- the density of the protogalactic cloud from which the galaxy was born.
- collisions or other interactions that the galaxy has had with other galaxies in the past.
As explained in the video and your textbook, the density and rotation rate of a protogalactic clouds are birth conditions that likely influence a galaxy's type, but types can also change through later interactions.