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Mystery of the Missing Galaxy Clusters
Astronomers have counted up the number of galaxy clusters in the cosmos and found a problem: the number is much lower than they expected. What's going on?
New Heavyweight Galaxy Cluster
Astronomers have discovered a supermassive galaxy cluster that both meets and challenges expectations for how clusters ought to behave.
Hubble Images Stir Up Dark Matter Debate
Dark matter in the "Train Wreck" galaxy cluster (Abell 520) appears to behave in unusual ways. Now, new Hubble images are heating up the debate.
The Most Distant Galaxy Cluster
Many instruments working together have profiled a baby galaxy group, seen not long after the Big Bang, of the kind that probably evolved into our Milky Way.
