Hubble Space Telescope Sees Rich Galaxy Cluster

A new image from the NASA/ESA Hubble Space Telescope shows Abell 665, one of the richest galaxy clusters known.

This Hubble image shows the gigantic galaxy cluster Abell 665. Image credit: NASA / ESA / Hubble.

Abell 665 is located in the northern constellation of Ursa Major, approximately 2 billion light-years from our Milky Way Galaxy.

The cluster was named after its discoverer, American astronomer George O. Abell, who included it in his seminal 1958 cluster catalogue.

It is the only galaxy cluster in Abell’s entire catalogue to be given a richness class of 5, indicating that the cluster contains at least 300 individual galaxies.

Because of this richness, Abell 665 has been studied extensively at all wavelengths, resulting in a number of fascinating discoveries.

Among other research, the cluster has been found to host a giant radio halo, powerful shockwaves, and has been used to calculate an updated value for the Hubble constant.

This incredible image of Abell 665 is made up of observations from Hubble’s Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3) in the infrared and optical parts of the spectrum.

Four filters were used to sample various wavelengths.

The color results from assigning different hues to each monochromatic image associated with an individual filter.

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