NGC 253 shows the effect of powerful winds being launched in opposite directions from the center of the galaxy. Although it is a spiral like our Milky Way galaxy, NGC 253 is forming stars at a higher rate. These young massive stars and their supernova explosions propel the winds that play an important role in the lifecycle of stars and the galaxy.
http://www.nasa.gov/mission_pages/chandra/images/chandra-determines-what-makes-a-galaxys-wind-blow.html
