Oknight t1_j4mon6h wrote
Reply to comment by e_j_white in How do we know that we are in a certain place inside our galaxy? and how do we know how big it is just by looking at the cross section we are in? by friday_panda
But remember the size isn't really a determined thing... the galaxy doesn't have "start and end" points it's a vague cloud mostly of surrounding dark matter in a gigantic halo. There's a "center" to the spiral structure of the areas that are most actively forming stars and where gas and dust are densest but that isn't a strongly defined point the way the Sun is for the Solar System.
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