The top space stories of the week!

Baby stars create cosmic shockwaves, a dying star emits halos of different ages and a spiral galaxy can help refine physicists’ understanding of the universe’s expansion. These are some of the top photos this week from 

 Halos of different ages 

(Image credit: NASA, ESA, A. Hajian (University of Waterloo), H. Bond (Pennsylvania State University), and B. Balick (University of Washington); Processing: Gladys Kober (NASA/Catholic University of America))

This high-definition image from the Hubble Space Telescope showcases NGC 6891, a structure that formed after a supernova explosion. The bright spot in the center is a cooling stellar corpse called a white dwarf, and the orbs surrounding it are shells of gas.