VoilaVoilaWashington t1_j4law8c 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
> We thought it was 100K ly across, but some researchers in 2015 claimed it's 150K ly.
Just for clarity, this doesn't mean that the measured outer edge is actually that much farther away, but rather that we're finding things farther away.
It's a bit like saying a city is 10km across, but then realizing that there are actually buildings outside that radius. You didn't measure the original wrong, you simply expanded the definition.
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