Located about 710 light-years away from Earth is a red giant star called R Aquarii. A red giant star is a star that is at the end of its stellar evolution. It’s what will eventually happen to our own Sun. However, there is a lot going on in the photo below and actually, there are two stars in this photo. This story is about these two stars tangled in destiny. Credit: Hubble/NASA/ESA Let’s start with what is happening inside the red giant star R Aquarii. As it’s going through the last hurrah of its life the star is constantly contracting and expanding. As Phil Plait describes it, there is a small instability occurring in the star which triggers these physical contracts and expansions. As it contracts the star gets hotter. Then the pressure increases and the star starts to slow down the contraction and start to expand the star physically. This whole process lasts about...