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 | - ADAF Theory - Accretion disk theory, mixing-length theory of convection, advection-dominated accretion flows..
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 | - The Astrophysics Spectator - Articles published on this site cover current research in astronomy and astrophysics, describe our current understanding of astronomical phenomena, and comment on issues related to astronomical research..
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 | - Cambridge Relativity - Beginner's guide to all the basic concepts of Astrophysics written by active scientists at Cambridge University, UK..
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 | - Cause of the Characteristics of Quasars - Hypothesis which attempts to explain the characteristics of QSOs (Quasi-Steller Objects), a.k.a. quasars, as optical illusions created by gravitational lensing and other phenomena..
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 | - Contents - Accretion in astrophysics - active galactic nuclei, processes and dynamics..
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 | - Dyson Sphere - A list of frequently asked questions with answers..
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 | - The Electric Universe - Physics knows four forces; 20th-century scientists were convinced that one of those, the electric force, played no macroscopic role in the Universe; site explains why that is incorrect..
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 | - Hands-On Astrophysics - Offers educational products that help students understand basic astronomy concepts..
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 | - Hyperspace - Site devoted to hyperspatial theories..
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- Interdisciplinary Astrophysics Group
 | - Living Reviews in Solar Physics - A peer-refereed, solely online journal publishing invited reviews covering all areas of solar and heliospheric physics research. Published by the Max Planck Institute for Aeronomy, Katlenburg-Lindau, Germany..
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 | - The NASA Astrophysics Data System - The Astrophysics Data System (ADS) is a NASA-funded project which maintains four bibliographic databases containing more than 4.0 million records: Astronomy and Astrophysics, Instrumentation, Physics and Geophysics, and preprints in Astronomy..
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 | - Network Generator - Generates astrophysical reaction rates online using an extended database..
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 | - Nuclear Astrophysics Data - An area for providing nuclear data for astrophysics calculations, such as nucleosynthesis, stellar evolution, the Big Bang, and super-nova dynamics..
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 | - Olber's Paradox Solved - A well know problem from astrophysics, Olber's paradox (Why is the night sky dark?), solved. As well as Newton's related Gravity paradox..
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 | - Red Shift by Photon Decay - Author explains how Hubble's red shift of starlight spectra results from photon decay, proportional to traveled distance..
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 | - SIMBAD Astronomical Database - The SIMBAD astronomical database provides basic data, cross-identifications and bibliography for astronomical objects outside the solar system. SIMBAD can be queried by object name, coordinates, other criteria (filters), and lists of objects..
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 | - Smithsonian Astrophysical Observatory - A research institute of the Smithsonian Institution headquartered in Cambridge, MA, where it is joined with the Harvard College Observatory (HCO) to form the Harvard-Smithsonian Center for Astrophysics (CfA)..
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 | - Temporal Annex - Information mostly on the fourth dimension and theoretical physics..
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 | - THIS-Tuneable Heterodyne Infrared Spectrometer - THIS - instrument pages for the Tuneable Heterodyne Infrared Spectrometer developed by the University of Cologne. THIS is a transportable receiver designed for atmospheric and astrophysical observations in the mid infrared spectral region (7-28 µm)..
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