関連ワード:  is stephenson 2-18 the largest star    is stephenson 2 18 the biggest star    is stephenson 2 18 the biggest star or uy scuti    is stephenson 2 18 the largest known star    is stephenson 2 18 the largest star in the universe    is stephenson 2-18 still the biggest star    is stephenson 2 18 the biggest star in the milky way    is stephenson 2 18 the biggest star in the world    why is stephenson 2 18 not the biggest star    is there a star bigger than stephenson 2-18