Image of Abell 2199, a massive galaxy cluster containing thousands of galaxies. The light from this cluster has traveled 50 million years to reach Earth. The image highlights the mystery of dark matter, which dominates the cluster's mass despite being invisible.

Astronomy Picture from 22/01/1997

Galaxy Cluster A2199
Credit:

Source: https://apod.nasa.gov/apod/ap970122.html


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