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| Above the Skies, An Exploration into Our Universe Through Animated Spectroscopy - http://hea-www.harvard.edu/~efortin/thesis/html/index.shtml A description at the layman level about the applications of spectroscopy in the investigation of the Solar System, with interactive diagram |
| ADC Quick Reference: Basic Data on Galaxies - http://adc.astro.umd.edu/adc/quick_ref/ref_generalgalaxies.html An online astrophysics catalog that helps the user toward some of the more frequently used ADC dataset holdings regarding galaxies |
| AstroEngine - http://www.astroengine.com Space science blog by Dr Ian ONeill discussing astrophysics concepts in an informed yet informal way |
| Astrophysics - http://www.physicsplanet.com/articles/astrophysics A short introduction to astrophysics with associated articles on a number of topics |
| Astrophysics - http://en.wikipedia.org/wiki/Astrophysics Wikipedia article on this branch of astronomy that deals with the physics of the universe, including the physical properties of celestial objects and the interstellar medium, as well as their interactions |
| Astrophysics - http://www.arxiv.org/archive/astro-ph E-Print archive since April of 1992 |
| Astrophysics and Astronomy - http://www.hpwt.de/Astroe.htm Introductory essays on astrophysics and astronomy |
| Cambridge Relativity - http://www.damtp.cam.ac.uk/user/gr/public/ Beginners guide to all the basic concepts of Astrophysics written by active scientists at Cambridge University, UK |
| Canadian Institute for Theoretical Astrophysics - http://www.cita.utoronto.ca Nationally supported research centre. Find out about current research, upcoming seminars and job opportunities |
| Cause of the Spectral Characteristics of Quasars - http://charles_w.tripod.com/quasar.html Hypothesis by Charles Weber which attempts to explain the characteristics of quasi-stellar objects as optical illusions created by gravitational lensing and other phenomena |
| Dyson Sphere - http://www.nada.kth.se/~asa/dysonFAQ.html A list of frequently asked questions with answers |
| Encyclopedia of Astronomy and Astrophysics - http://eaa.iop.org/ Comprehensive archive of explanatory articles on all key Astrophysics topics, categorised and fully searchable; actively updated by the Institute of Physics |
| Encyclopedia of Astrophysics - http://www.scholarpedia.org/article/Encyclopedia_of_astrophysics A free peer-reviewed online publication written by scholars from around the world |
| Fermilab Theoretical Astrophysics Group - http://www-astro-theory.fnal.gov Partially funded by a NASA Astrophysics Theory grant, find information about the groups past and future meetings |
| Grand Challenge Problems in Computational Astrophysics - http://www.ipam.ucla.edu/programs/pca2005/ Research session at the Institute for Pure and Applied Mathematics (IPAM), Los Angeles, CA, USA; 7 March10 June 2005 |
 | Gravity is Cool, or, Why our Universe is Hospitable to Life - http://www.hartford-hwp.com/archives/20/035.html Text of the 1999 Oppenheimer lecture at UC Berkeley given by professor Freeman Dyson on the origin of life and other subjects |
| Hands-On Astrophysics - http://hoa.aavso.org Offers educational products that help students understand basic astronomy concepts |
| High Energy Astrophysics Group - http://altamira.asu.cas.cz/ Astronomical Institute, Ondrejov. Focuses on the research of cosmic objects in X-ray and gamma spectra region. General information, projects and workshops |
| Hubble Red Shift and Quantum Evolution - http://www.eskimo.com/~mikel137/ Michael Lewis provides an equation describing the Hubble red shift light decay curve using existing mathematics |
| Hyperspace - http://artling.tripod.com Site devoted to hyperspatial theories |
