Rare ‘Pinwheel’ Stars Are a Beautiful Astronomical Puzzle
[ad_1] Astronomers tend to exhaust superlatives when they talk about the ferociously hot and luminous stars known as Wolf-Rayets, which are among the largest, hottest and rarest stars in the universe. Wolf-Rayets are believed to be the final, fleeting stage in the lives of the most massive stars—those starting life with anywhere from 20 to