11.   The mystery of these dying stars has intrigued scientists for more than two centuries.

12.   Two of the new images from the Hubble Space Telescope are the first to show concentric shells of gas blown out by dying stars.

13.   Wang believes he has spotted the aftermath of hypernovas, theoretical events in which dying stars blow off their outer layers and collapse into black holes.

14.   When dying stars explode, they heat the gas around them, creating pressures that push the gas up and away like a colossal bubble.

15.   Bethe cups his hand to illustrate compression inside a dying star.

16.   These cosmic flashes may come from the explosion of dying stars called supernovas.

17.   White dwarfs are the chilling cinders of a dying star.