These radio galaxies tremendously emit radio rays as compared to common galaxies. The human eye can not see these radio rays but a radio signal antenna can feel these kinds of radio rays. Alcyoneus Radion Galaxy has been discovered long ago but its extraordinary size was revealed while reviewing the observations of the greatest European project LOFAR (Low-Frequency Array) in recent years.
Under the LOFAR Project, 20 thousand antennas have been installed at 52 different locations in Europe for celestial observations. The antennas combined to work like the biggest telescope. There are some huge radio galaxies which are called GRGs (Giant Radio Galaxies).
A team of experts from France, Germany, and South Africa under the leadership of Martin Oei of Leiden University Holland has begun to review these Giant Radio Galaxies already discovered with the help of the LOFAR Project which is meant to search a great galaxy. Radio galaxies are like common galaxies but a powerful plasma of charged particles bursts from the center of radio galaxies making earlobe-like structures that spread millions of light-years away from the center of a radio galaxy.