A new study has revealed that nineteen Wolf-Rayet stars have been discovered in the Andromeda galaxy. These stars are around 20-50 times larger than our sun, and are among the brightest and most massive stars known. They are characterised by their strong emission lines of ionized helium and nitrogen in their spectra, and can be found in some of the most active star-forming regions in the universe. This finding provides insight into the star-formation history of the Andromeda galaxy, and could be used to inform our understanding of star formation in other galaxies.

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source: Phys.org