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Star formation in the outskirts of galaxies

Star Formation environments can be roughly grouped into three types, categorized by the density of their gas (or more precisely, the projected "surface" density of the gas, which is easier to determine than the conventional volume density). Star Formation in the outer spiral regions of the galaxy NGC 4625 is seen in ultraviolet  light (blue); these arms are nearly invisible in optical light, but have hot, newborn stars  that...

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Star formation in the outskirts of galaxies

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