High Quality Content by WIKIPEDIA articles!Wolf-Rayet stars (often referred to as WR stars) are evolved, massive stars (over 20 solar masses), which are losing mass rapidly by means of a very strong stellar wind, with speeds up to 2000 km/s. While our own Sun loses approximately 10?14 solar masses every year, Wolf-Rayet stars typically lose 10?5 solar masses a year. Wolf-Rayet stars are very hot, with surface temperatures in the range of 25,000 K to 50,000 K.

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