This star "hypervelocity" and twice as big as the sun, was probably ejected by the supermassive central black hole of our galaxy.
https://academic.oup.com/mnras/adva...mnras/stz3081/5612212?redirectedFrom=fulltext
https://academic.oup.com/mnras/adva...mnras/stz3081/5612212?redirectedFrom=fulltext