Galaxy drags trail of stars behind it
Collisions with hot gas trigger streaks of stellar births
![Galaxy ESO 137-011](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/03/cc_heic1404a_galaxy_feat_free.jpg?fit=860%2C460&ssl=1)
STAR RIVERS The galaxy ESO 137-001, 200 million light-years away, leaves trails (shown in blue in this false-color Hubble Space Telescope image) of gas and newly born stars as it plows through the Norma Cluster. Bright stars in the foreground sit within our galaxy.
Ming Sun/UAH, Serge Meunier, NASA, ESA