You Be the Astrophysicist Interactive site for learning about astronomy and astrophysics. http://imagine.gsfc.nasa.gov/YBA/yba-intro.html

Hyperspace Site devoted to hyperspatial theories. http://artling.tripod.com

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). http://cfa-www.harvard.edu/newtop/saohome.html

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. http://solarphysics.livingreviews.org

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. http://home.wanadoo.nl/ronald.koster/olber.html

Red Shift by Photon Decay Author explains how Hubble's red shift of starlight spectra results from photon decay, proportional to traveled distance. http://members.chello.nl/~n.benschop

Hands-On Astrophysics Offers educational products that help students understand basic astronomy concepts. http://hoa.aavso.org

Canadian Institute for Theoretical Astrophysics Nationally supported research centre. Find out about current research, upcoming seminars and job opportunities. http://www.cita.utoronto.ca

Fermilab Theoretical Astrophysics Group Partially funded by a NASA Astrophysics Theory grant, find information about the group's past and future meetings. http://www-astro-theory.fnal.gov

Famous Astrophysicists Profiles several prominent astrophysicists. http://www.famous-astrophysicists.com

WCRI WalkerScience Examines several aspects of astrophysics including the big bang, origin of heavy elements and satellites, dark matter and dark energy. http://users.rcn.com/wcri/wcri

Modified Newtonian Dynamics Overview of a controversial theory which is not generally accepted by the astrophysical community. http://members.rogers.com/mercy/

Physical Concepts Explains astrophysical concepts such as relativity, quantum mechanics, gravity, black holes, dark matter, quasars, macrocosmos and microcosmos. http://www.solnabrass.com/phycon/

Physics Topics - Teaching Notes Teaching notes on celestial mechanics, classical mechanics, and stellar atmospheres. http://orca.phys.uvic.ca/~tatum/

Grand Challenge Problems in Computational Astrophysics Research session at the Institute for Pure and Applied Mathematics (IPAM), Los Angeles, CA, USA; 7 March - 10 June 2005. http://www.ipam.ucla.edu/programs/pca2005/

Astrophysical Data A nice beginners collection of constants and other data, assorted in one page... Beginner level, with links to more advanced sites. http://www.astro.uni-bonn.de/~jbraun/w3_apd.html

The Titius-Bode Number Sequence Deciphered An explanation of the Titius-Bode Law of planetary spacing. http://users.telenet.be/TaoWeb/TitiusBode.htm

Titius-Bode Law Overview of the Titius-Bode Law. http://milan.milanovic.org/math/english/titius/titius.html

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. http://simbad.u-strasbg.fr/Simbad

AMASE - Astrophysics Multi-spectral Archive Search Engine An online astrophysics catalog developed using object-oriented database technology to help researchers locate multi-mission data in the NASA archives. http://adc.gsfc.nasa.gov/amase/