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A4c – Principi di Astrofisica Le Galassie 2
The galactic coordinate system. Positions of objects are measured in terms of their galactic longitude ( l ) and galactic latitude ( b ). The galactic equator slices the Galaxy in half (top and bottom).
km/s
perchè n=N/V=1/d3
perchè n=N/V=1/d3