IC 1101 – The Largest Galaxy in the Observable Universe

IC 1101, an elliptical galaxy at the heart of the Abell 2029 Galaxy Cluster, is a truly mind-boggling structure. With a radius of more than 2 million light years, IC 1101 comfortably ranks as the largest galaxy yet recorded. First observed by William Herschel on June 19, 1790, this supergiant is estimated to contain over 100 trillion stars.

For more details on IC 1101 check out this great article.