- These galaxies emit radio signals up to 100,000,000 times stronger than our own. These radio signals don't originate from the galaxy itself, but from a plasma cloud (superheated, ionized gases) located hundreds of thousands to millions of light years away from the Radio Galaxy. It is not uncommon for these plasma clouds to be 100 times larger than the Radio Galaxy. They are one of the largest known objects in the universe. The source of the tremendous amount of energy needed to generate these powerful signals, and how they are converted to radio waves, is still a mystery. It is possible that a Black Hole is located at the center of the galactic nucleus, and it supplies the needed energy for the radio signal, which is transferred from the Black Hole to the plasma cloud.
The writer's dictionary of science fiction, fantasy, horror and mythology. 2014.
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radio and radar astronomy — Study of celestial bodies by measuring the energy they emit or reflect at radio wavelengths. It began in 1931 with Karl Jansky s discovery of radio waves from an extraterrestrial source. After 1945, huge dish antennas, improved receivers and data … Universalium
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