Can someone help with bright blue-white star in the constellation Orion?

[Sleep is all you need :)]

Lim told Yolanda that he bright blue-white star in the constellation Orion is called Rigel. It is 900 light-years away. Yolanda then wondered whether Rigel still exists. What answer could Lim give Yolanda?

I don't know need help please explain Thankyou 10 points best answer!