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Cosmology

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.

Galaxies

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.