Which of the following statements about Quasars is true?
1
Quasars are most luminous in the radio frequency range, with limited emissions in other spectra
2
Quasars are powered by quantum fluctuations, not gravitational forces.
3
Quasars are highly luminous objects powered by supermassive black holes at the centers of galaxies
4
All quasars are located within our Milky Way galaxy.