Image Archive: Cosmology 
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| Astronomers use Hubble to measure the Expansion Rate of the Universe | Hubble Observes the Lost Ancestors to Our Milky Way Galaxy | Quasar Host Galaxy | Quasar Host Galaxy |
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| HST Photographs a Cluster of Galaxies Four Billion Light-years Away | The Farthest Cluster of Galaxies Ever Seen? | A "Hubble Atlas" of Ancient Galaxies | Gravitational Lens in Galaxy Cluster AC 114 |
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| Galaxy Cluster Abell 520's mass (HST WFPC2) | Gravitational lens forms giant arc | The core of RCS2 032727-132623 and reconstruction of RCSGA 032727-132609 | Using gravitational lensing to observe the disc around a black hole |
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| Galaxy M84 Nucleus | Galaxy Cluster Abell 520's hot gas (Chandra) | Merging Galaxy Cluster Abell 520 | Galaxy Cluster Abell 520's Luminosity (CFHT) |
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| Galaxy Cluster Abell 520 (HST-CFHT-CXO composite) | Galaxy Cluster Abell 520 (CFHT and HST) | Galaxy Cluster Abell 520 (plus CFHT, HST, CFHT/HST, and CXO overlays) | |
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