NASAのインスタグラム(nasa) - 5月15日 04時05分

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.

Image credit: NASA/GSFC/National Center for Supercomputing/Advanced Visualization Laboratoy/B. O'Shea and M. Norman
#nasa #space #galaxies #galaxy #universe

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