Astrophysics is the branch of astronomy that deals with the physics of the universe, including the physical properties (luminosity, density, temperature, and chemical composition) of celestial objects and the interstellar medium, as well as their interactions.
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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.
- Cambridge Relativity Beginner's guide to all the basic concepts of Astrophysics written by active scientists at Cambridge University, UK.
- Network Generator Generates astrophysical reaction rates online using an extended database.
- NASA Astrophysics Data System Search system for abstracts in astrophysics, planetary sciences and solar physics.
- Astrophysics and Astronomy Introductory essays on astrophysics and astronomy.
- Temporal Annex Information mostly on the fourth dimension and theoretical physics.
- Astrophysics E-Print archive since April of 1992.
- High Energy Astrophysics Group Astronomical Institute, Ondrejov. Focuses on the research of cosmic objects in X-ray and gamma spectra region. General information, projects and workshops.
- 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.
- Canadian Institute for Theoretical Astrophysics Nationally supported research centre. Find out about current research, upcoming seminars and job opportunities.
- Physics Topics - Teaching Notes Teaching notes on celestial mechanics, classical mechanics, and stellar atmospheres.
- Gravity is Cool, or, Why our Universe is Hospitable to Life Text of the 1999 Oppenheimer lecture at UC Berkeley given by professor Freeman Dyson on the origin of life and other subjects.
- 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.
- 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.
- Olber's Paradox A well know problem from astrophysics, Olber's paradox (Why is the night sky dark?), solved. As well as Newton's related Gravity paradox.
- Astrophysics A short introduction to astrophysics with associated articles on a number of topics.
- Encyclopedia of Astrophysics A free peer-reviewed online publication written by scholars from around the world.
- Tuneable Heterodyne Infrared Spectrometer - THIS Instrument pages for the transportable receiver designed for atmospheric and astrophysical observations in the mid infrared spectral region (7-28 µm). Developed by the University of Cologne.
- 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).
- 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.
- AstroEngine Space science blog by Dr Ian O'Neill discussing astrophysics concepts in an informed yet informal way.
- Cause of the Spectral Characteristics of Quasars Hypothesis which attempts to explain the characteristics of quasi-stellar objects as optical illusions created by gravitational lensing and other phenomena.
- The Astrophysical Journal Devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
- Space Physics Textbook A free online introduction to space physics in the areas of plasma physics, regions, phenomena, instrumentation and modeling. Last updated October 7, 2008.
- Dyson Sphere A list of frequently asked questions with answers.
- Encyclopedia of Astronomy and Astrophysics Comprehensive archive of explanatory articles on all key Astrophysics topics, categorised and fully searchable; actively updated by the Institute of Physics.
- Fermilab Center for Particle Astrophysics Partially funded by a NASA Astrophysics Theory grant, find information about the group's past and future meetings.
- The Structure, Stability, and Dynamics of Self-Gravitating Systems An interactive Astrophysics textbook from Louisiana State University.
- Hubble Distance Shift and the Action Quantum of Light Michael Lewis provides an equation describing the Hubble red shift light decay curve using existing mathematics.
- Nuclear Astrophysics Data An area for providing nuclear data for astrophysics calculations, such as nucleosynthesis, stellar evolution, the Big Bang, and super-nova dynamics.