Two galaxies locked together in an intricate gravitational dance have created a beautiful illusion in the depths of space.
, and together they constitute an elegant example of one of the most colossal events in the Universe, a galactic merger.
Galactic mergers take place when galaxies are gravitationally drawn together across the gulfs of space-time, performing an increasingly tight orbital dance before coming together to form one big galaxy. During these events, surprisingly few objects actually collide with each other; galaxies are mostly empty space by volume. However, the gravitational interactions can create shocks in surrounding star-forming gas that results in waves of star formation, rippling across each of the galaxies as the merger takes place.
These mergers are thought to be a vital aspect of galactic growth and evolution. Not only can the process revive star formation in otherwise relatively quiescent galaxies, it could play a role in the expansion of supermassiveFound at the heart of each galaxy, these black hole behemoths are somewhat baffling; merging with other supermassive black holes could be one pathway to their incredible size..
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