Why are quasars so bright?
Quasars are brilliant active nuclei powered by matter falling around supermassive black holes in distant galaxies.
Formation, motion and physical explanation
Frictional and magnetic processes in an accretion disk convert gravitational energy to radiation. The light comes from hot surroundings, not inside the horizon.
Evidence, applications and limits
Broad spectral lines reveal fast gas, and brightness changes imply a compact source. Some systems also launch relativistic jets. Conclusions about distant objects rely on testing images, spectra, time variation and physical models together.
Related topics
What is erosion?Why does apoptosis remove cells in a controlled way?What is a microbiome?What is DNA?What is an isotope?How does electrolysis work?What is the Higgs boson?How do synapses transmit signals?What is meiosis?What does sublimation mean?Why does diffraction occur?What is quantum physics?What is sound?How does buoyancy work?What does the Roche limit mean?What is superconductivity?EarthquakeHow do white dwarfs form?What is the rock cycle?Why does the Moon show the same face?How does osmosis occur?How do ribosomes make proteins?How does the photoelectric effect work?What is plate tectonics?How do Lagrange points work?How do hormones communicate with cells?What is RNA?Why does eutrophication occur?What is a chemical reaction?What is a magnetic field?