QUESTION 4 4 points
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Place the steps in the formation of a spiral galaxy in order, starting from the beginning.
The clumping of material in the disk and spiral arms triggers further waves of star formation. The central bulge has become a
crowded place by this point, and a central supermassive black hole has formed or will do so shortly, and may go through an active
galactic nucleus phase.
During the last stages of the collapse, gas and dust from stars which have already died settle into a disk. Density waves start to
form the spiral arms.
Some regions in the early Universe become denser than others (possibly due to underlying dark matter).
Spiral galaxy
Stars start to form in the outer parts of the giant collapsing cloud, the parts which will become the galactic halo. Some high mass
stars go through their lifespans very rapidly, releasing the products of their nuclear fusion into the collapsing cloud, enriching it.
As the cloud continues tehollapse, gravitational potential energy turns into kinetic energy and material starts to collide. Angular
momentum and collisions start to flatten the cloud into a disk. Star formation starts in the inward portions of the cloud.
Big Bang
In a denser region, a giant cloud of slowly rotating material starts to collapse gravitationally,

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