Astronomers have identified the largest galaxy ever discovered.
Alcyoneus, as it was named, is about 3 billion light-years away. It has a length of 5 megaparsecs (16.3 billion light years). It has a mass 240 billion times that of our Sun and has a black hole at its center with a mass about 400 million times that of our Sun.
It is considered that it continues to grow.
To astronomers, giant galaxies are a mystery to the universe. Also mysterious are the large-scale environments that contribute to their development.
[Source: http://www.huffingtonpost.gr]
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