As a result, they experience very little ongoing star formation and consist mainly of old and aging stars,» ESA explained in a statement accompanying the photograph. (ibtimes.com)
Spiral galaxies — like the ones believed to be torn apart — can sustain ongoing star formation that creates chemically enriched stars. (sciencedaily.com)
They are areas where very massive stars have recently formed, and many contain the uncondensed gas, dust, and molecular complexes commonly associated with ongoing star formation. (britannica.com)