Astronomy and astrophysics has changed our knowledge of the Universe. The Earth is not the center of the Universe. We are very small things in our Universe. The Univere, moreover, shows us the limited things inside it.
The progress of astronomy and astrophysics has been benefited from physics, mathematics, and computer science. The physics has transformed astronomy into astrophysics. As all science disciplines are based on the current mathematics, astronomers and astrophysicists have adopted mathematics as their research language. Since computer science has risen rapidly, the development and its ability of computer has encouraged astronomers and astrophysicists to handle massive observational data and computational tasks.

If you want to know the Universe as astronomer and astrophysicist, you should study these.

* Good textbooks
- Introductory astronomy & astrophysics(Michael Zeilik and Stephen A. Gregory)
- Globular clusters : X Canary Islands Winter School of Astrophysics(Edited by C. Martinez Roger, I Perez Fournon, and F. Sanchez)
- Galactic astronomy(James Binney and Michael Merrifield)
- Observational astrophysics(P. Lena, F. Lebrun, and F. Mignard)
- Astrophysical concepts(Martin Harwit)
- Unsolved problems in astrophysics(Edited by John N. Bahcall and Jeremiah P. Ostriker)
- Optics in astronomy(Edited by J. V. Wall)
- Galaxies in the universe : an introduction(Linda S. Sparke and John S. Gallagher III)
- Galaxy formation(Malcolm S. Longair)
- 3K : the cosmic microwave background radiation(R. B. Partridge)
- High energy astrophysics, v. 1, Particles, photons and their detection(M. S. Longair)
- High energy astrophysics, v. 2, Stars, the galaxy and the interstellar medium(M. S. Longair)
- Numerical modeling in applied physics and astrophysics(Richard L. Bowers and James R. Wilson)
- Optical astronomical spectroscopy(C.R. Kitchin)
- Interpreting astronomical spectra(D. Emerson)

* Useful sites
- International Astronomy Meetings List
- VISUAL MEDIA SERVICES@FERMILAB, USA
- ITP Online Conferences, Lectures and Seminars
- Space Science@NASA
- NASA SPACE SCIENCE DATA SYSTEM (SSDS)
- Astronomical Software & Documentation Service
- The NASA Astrophysics Data System
- NASA Astronomical Data Center
- Multimission Archive at Space Telescope(MAST)
- The Strasbourg astronomical Data Center (CDS), Strasbourg
- CANADIAN ASTRONOMY DATA CENTRE
- Infrared Processing and Analysis Center (IPAC)
- NASA/IPAC Extragalactic Database (NED)
- Lyon-Meudon Extragalactic Database (LEDA)
- @.@AstroWeb: Astronomy/Astrophysics on the Internet
- NASA High Energy Astrophysics Science Archive Research Center (HEASARC)
- Astrophysics Source Code Library
- NASA Planetary Data System
- Encyclopedia of Astronomy and Astrophysics
- the Fact Guru Astronomy knowledge base
- IAU: The Constellations
Note:You might find all web sites for Astronomy and Astrophysics at @.@.

* Journals and Magazines
- Acta Astronomica
- Astrobiology
- The Astronomical Journal (AJ)
- ASTRONOMY magazine
- Astronomy & Geophysics
- Astronomy and Astrophysics (A&A)
- Astronomy and Astrophysics Supplement Series (A&AS)
- Astronomy Now
- The Astrophysical Journal (ApJ)
- Astrophysical Journal Letters (ApJL)
- Astrophysical Journal Supplement (ApJS)
- Astrophysics and Space Science (A&SS)
- ICARUS
- Journal of Astronomical Data
- Journal of Astronomy and Space Science (JASS)
- Mercury Magazine
- Monthly Notices of the Royal Astronomical Society (MNRAS)
- Nature
- New Astronomy
- New Astronomy Reviews (Former title: Vistas in Astronomy)
- New Scientist
- Observatory Magazine
- Publications of the Astronomical Society of Australia (PASA)
- Publications of the Astronomical Society of Japan (PASJ)
- Publications of the Astronomical Society ofthe Pacific (PASP)
- Science Magazine
- Scientific American
- Sky & Telescope
Note:There are "Abstracts of Astronomical Publications" at http://www.cv.nrao.edu/fits/www/yp_abstracts.html and "Full-texts of Astronomical Publications" at http://www.cv.nrao.edu/fits/www/yp_full_text.html.

* Meetings in Korea
- Open KIAS Summer Institute: Issues on Structure Formation | IGRINS Summer School | The 1st KIAS CAC Winter School on Parallel Computing | The 2nd KIAS CAC Summer School on Parallel Computing