- FAQ - Quasars
 - Answers to question submitted by K-12 students to Dr. John Simonetti of the Department of Physics at Virginia Tech. - Quasars and Active Galactic Nuclei
- Introduction to the subject of active galactic nuclei, with photos, spectra, and articles.
- ADC Quick Reference: Basic Data on Quasars and AGN
- Provides data on quasars, Seyferts, BL Lac objects and optically variable QSOs, and other active galaxies, AGN, and emission-line objects.
- Active Galaxies & Quasars - Jodrell Bank Observatory
- Researching neutral gas and dust in active galaxies, activity in starbursts and Seyfert galaxies, DRAGNs, gravitational lenses, and related matters.
- Cause of the Characteristics of Quasars
- Hypothesis that posits quasars are caused by gravitational lensing of photons from the opposite jet by a huge mass within an active galaxy.
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