What is the approximate span across the entire Local Group in light-years?
Answer
10 million light-years
To contextualize the density of matter within our immediate vicinity, the overall physical size or diameter of the Local Group is estimated to span approximately 10 million light-years across. This size measurement demonstrates a local concentration of matter that is significantly higher than the average density observed across the broader universe. The figure of 2.5 million light-years is specifically cited as the separation distance between the Milky Way and the Andromeda Galaxy, not the total extent of the entire collection.
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