University of Arizona astronomers have identified five examples of a new class of stellar system located in the relatively nearby Virgo galaxy cluster. Not quite galaxies, the new systems – which astronomers say appear through a telescope as "blue blobs" – contain only young, blue stars, which are distributed in an irregular pattern and seem to exist in surprising isolation from any potential parent galaxy. "It's a lesson in the unexpected," said Michael Jones, a postdoctoral fellow in the UArizona Steward Observatory who led the research.