#galaxy-collisions

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#cosmology #universal-expansion #gravity #ring-galaxies #star-formation #galaxy-morphology
Science
fromwww.scientificamerican.com
1 week ago

How can galaxies ever collide in an ever-expanding universe?

Galaxies can collide despite cosmic expansion because expansion dominates only on very large scales, while gravity and local motions can bring galaxies together.
Science
fromBig Think
2 months ago

Ring galaxies, the rarest galaxy type of all, are finally understood

Ring galaxies, extremely rare (~1-in-10,000), form when head-on collisions produce outward-propagating density waves that trigger ring-shaped star formation.
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