The Galaxy Gallery: Messier Objects - http://zebu.uoregon.edu/messier.html

函堡己 - http://astro.chungbuk.ac.kr/~jangsh/paper/3_6_1.htm

HOA - Variable Star Charts - http://hoa.aavso.org/starcharts.htm

Eclipsing Binary Stars - http://www.isc.tamu.edu/~astro/binstar.html

AAVSO: What Are Variable Stars - http://www.aavso.org/variablestars.htm

Variables - http://www.demon.co.uk/astronomer/variables.html

BAAVSS archive - http://www.telf-ast.demon.co.uk

VSNET - An International Mailing List on Variable Stars - http://www.kusastro.kyoto-u.ac.jp/vsnet

StarWorlds - Astronomy and Related Organizations - http://cdsweb.u-strasbg.fr/~heck/sfworlds.htm

AstroGLU - http://simbad.u-strasbg.fr/glu/cgi-bin/astroglu.pl

AstroGLU - http://simbad.u-strasbg.fr/glu/cgi-bin/astroglu.pl

The Double Star Library - http://www.chara.gsu.edu/DoubleStars/intro.html

Samples of Close Binaries - http://www.mtwilson.edu/Science/AdapOpt/ACE/samples.html

Mass Transfer in the Binary Star Algol - http://wonka.physics.ncsu.edu/www/Astro/Research/Algol/index.html

Educational Observatory - http://www.cnde.iastate.edu/aaaa.html

The Hipparcos Space Astronomy Mission: Variables - http://astro.estec.esa.nl/SA-general/Projects/Hipparcos/variable.html

Cepheid Variables in M100 - http://physics.hallym.ac.kr/education/stellar/hst/pubinfo/PR/94/49.html

辫瘤清

http://www.aavso.org

http://www.supernovae.net/isn.htm

http://www.demon.co.uk/astronomer/variables.html

http://www.kusastro.kyoto-u.ac.jp/vsnet/information.html

http://cba.phys.columbia.edu/

http://imagine.gsfc.nasa.gov/docs/science/know_11/supernovae.html

http://csep10.phys.utk.edu/astr162/lect/variables/variables.html

http://www.oat.ts.astro.it/aol/instruE.html

http://www.telf-ast.demon.co.uk

http://astrosun.tn.cornell.edu/courses/astro201/novae.htm