You stated that the Milky Way rotates by using differential galactic rotation. Do all the other galaxy types rotate as well? If so, do they use this form of rotation?
All spiral galaxies do rotate around the central bulge and have spiral arms. Elliptical galaxies do not rotate in an organized fashion or have spiral arms. Individual stars do orbit the center of an elliptical galaxy. Irregular galaxies are disorganized.
Protogalactic clouds cooled and the first generation of stars were then formed. After a few million years, these supernovae seeded the galaxy with heavy elements and then heated the surrounding gas. This heating slowed the collapse, and the rest of the gas settled slowly into a rotating disk.
You stated that the Milky Way rotates by using differential galactic rotation. Do all the other galaxy types rotate as well? If so, do they use this form of rotation?
ReplyDeleteAll spiral galaxies do rotate around the central bulge and have spiral arms. Elliptical galaxies do not rotate in an organized fashion or have spiral arms. Individual stars do orbit the center of an elliptical galaxy. Irregular galaxies are disorganized.
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ReplyDeleteHow and why did the protogalactic cloud collapse? What does that process look like?
ReplyDeleteProtogalactic clouds cooled and the first generation of stars were then formed. After a few million years, these supernovae seeded the galaxy with heavy elements and then heated the surrounding gas. This heating slowed the collapse, and the rest of the gas settled slowly into a rotating disk.
DeleteHow and why did the protogalactic cloud collapse? What does that process look like?
ReplyDelete