Much important science can be done on the galactic center region with the SMA. The center of our galaxy, being about two orders of magnitude closer to us than the centers of other normal galaxies, is an important laboratory where the innermost workings of galaxies can be characterized with good resolution and sensitivity. Perhaps the overarching questions to be answered are: How does matter, both stars and gas, flow into the center region? How does matter act close to the event horizon of a supermassive black hole at the galactic center and give rise to phenomena such as relativistic jets? Do supermassive black holes form before galaxies, or vice versa? The discussion can be approached in descending order of size scales.
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