Hubble has investigated wandering stars that aren't tied to any particular galaxy and found that they are giving off a ghostly haze of light.
When most people learn about the structure of the universe at school, the model is simple: planets rotate around stars, and stars cluster together in galaxies, of which there are many in the universe. You might even have learned that galaxies can often group together by the thousand in enormous galaxy clusters.
The difficult question that astronomers have been pondering is how rogue stars become scattered throughout a galaxy cluster, as they were unsure whether the clusters pulled in the rogue stars long after they formed, or whether the stars were already present as the cluster formed around them. To answer this, a group used Hubble to look at intracluster light, which is the diffuse and very dim light seen around and within galaxy clusters that isn’t related to specific galaxies within the cluster.
The fact that even long ago, stars were wandering through these clusters means that there must have been some mechanism creating homeless stars in the early universe which we don’t yet know about. “We don’t exactly know what made them homeless,” Jee said. “Current theories cannot explain our results, but somehow they were produced in large quantities in the early universe.”
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