https://phys.org/news/2018-07-image-herschel-astrophysical-terahertz-large.html

The North Galactic Pole lies far from the cluttered disc of the Milky Way, and offers a clean, clear view of the distant Universe beyond our home galaxy. In the sky, it is located somewhere in the northern constellation of Coma Berenices (Berenice's Hair), a region that also contains an especially rich galaxy cluster known as the Coma Cluster. Serendipitously, the Coma Cluster is included in this map, adding over 1000 points of light to the tally of individual galaxies.

Herschel was active from 2009 to 2013, and used its instruments to study the sky in the far infrared. SPIRE was particularly well-suited to mapping large areas of sky, and observed the North Galactic Pole in three different filters simultaneously – such observations can be used to produce multicoloured images.