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Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
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Updated: Jun 17, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Quasars.

H J Smith1

  • 1Department of Astronomy and Mc-Donald Observatory, The University of Texas, Austin, Texas78712, USA.

Applied Optics
|January 9, 2010
PubMed
Summary
This summary is machine-generated.

Quasars, the most distant observable objects, possess immense luminosities requiring millions of solar masses. Their study illuminates galaxy evolution and the universe's origins.

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Last Updated: Jun 17, 2026

Quasi-light Storage for Optical Data Packets
07:45

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Published on: February 6, 2014

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06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Area of Science:

  • Astronomy and Astrophysics
  • Cosmology

Background:

  • Quasars (quasi-stellar objects) are enigmatic celestial bodies.
  • Their discovery raised fundamental questions about their nature, distance, and intrinsic properties.

Purpose of the Study:

  • To explore the nature and properties of quasars.
  • To evaluate arguments regarding their reality, distance, and age.
  • To investigate the physical processes behind their extreme luminosities.

Main Methods:

  • Historical review of quasar discovery.
  • Analysis of observational data on quasar properties.
  • Theoretical modeling of mass requirements for quasar luminosity.

Main Results:

  • Quasars are strong candidates for the most distant observable objects.
  • Their extreme luminosities necessitate masses equivalent to millions of solar masses.
  • The concentration of this mass may involve novel physics.

Conclusions:

  • Quasars likely represent the universe's most distant objects.
  • Understanding quasars is crucial for galaxy evolution studies.
  • Quasars offer insights into the universe's structure and origin.