At a certain point in their lifetimes, each star will expand into a red giant, then turn into a white dwarf.

An artist's impression highlighting the positions of the Big Ring (in blue) and Giant Arc (shown in red) in the sky ... our understanding of the universe. It cannot be seen with the naked eye.

Red Giant and a White Dwarf R Aquarii consists ... illustrating how stars contribute to the chemical makeup of the universe. The nebula surrounding R Aquarii, known as Cederblad 211, stretches ...