Abell 399 and Abell 401, connected by a bridge of hot gas

This image shows galaxy clusters Abell 399, lower center, and Abell 401 connected by a bridge of hot gas (ESA Planck Collaboration / STScI Digitized Sky Survey)

 Planck’s primary task is to capture the most ancient light of the cosmos. If this faint light interacts with the hot gas permeating different types of space structures including galaxies and galaxy clusters, its energy distribution is modified in a characteristic way, a phenomenon known as the Sunyaev-Zel’dovich (SZ) effect. See: Planck Discovers Huge Gas Filament Connecting Two Galaxy Clusters

 Astronomy & Astrophysics; arXiv: 1208.5911

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