Galaxies are collections of stars, gas, dust and dark matter held together by gravity. Their appearance and composition are shaped over billions of years by interactions with groups of stars and other galaxies. Using supercomputers, scientists can look back in time and simulate how a galaxy may have formed in the early universe and grown into what we see today. Galaxies are thought to begin as small clouds of stars and dust swirling through space. As other clouds get close, gravity sends these objects careening into one another and knits them into larger spinning packs. Subsequent collisions can sling material toward a galaxy’s outskirts, creating extensive spiral arms filled with colonies of stars. Check out the pictures and the link to the video below to see this process first hand…
When galaxies get close, gravity pulls them together, causing a collision.
Following a collision, stars and other material begin settling into orbits around a new galactic core.
Millions or even billions of years may pass before galaxies merge completely into a single larger galaxy.
Link to video… Enjoy!!!
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