In this composite image, blue areas represent X-ray emissions and yellowish regions represent visible light.
The apparent gap between the tail and the galaxy, known as CGCG254-021, suggests that the galaxy has been completely stripped of its gas.
"In effect, the tail has been cut off from the galaxy," study co-author Dr. Thomas Reiprich, also from the University of Bonn, said in the statement.
Big as it is, the tail is no match for the so-called Cold Spot, a stupendous cosmic bubble of sorts that astronomers say is some 1.8 billion light-years across. The Cold Spot may be the largest structure in the universe.
A paper describing the tail was published in the November 2015 issue of the journal Astronomy and Astrophysics.
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