Expanding shockwave
![](https://supernova.eso.org/static/archives/exhibitionimages/screen/VelaSNR_DSS_11Feb2007-CC.jpg)
Credit: Davide De Martin
These glowing ribbons of gas are part of a shock wave launched into the interstellar medium by a star that exploded as a supernova about 11 000 years ago. Despite its age, this supernova remnant is still expanding.