Distance ladder:

http://www.astro.washington.edu/labs/Distance_Ladder.html

 

Emission spectra of common elements:

http://home.achilles.net/~jtalbot/data/elements/index.html

  

Physics news updates:

http://www.aip.org/physnews/update/

 

Georgia State U. "Hyperphysics" (very nice):

http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

 

Cool Powers of 10 site:

http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/index.html

 

Wadsworth Astronomy Resource Center:

http://www.brookscole.com/astronomy/

 

Earth satellite viewing predictions:

http://www.heavens-above.com

 

American Meteor society:

http://www.amsmeteors.org/

 

NASA "space weather" (solar activity):

http://www.spaceweather.noaa.gov/

 

Spaceweather.com:

http://www.spaceweather.com/

 

Astronomical Society of the Pacific:

http://www.aspsky.org/

 

Hubble space telescope page:

http://www.stsci.edu/

 

Hubble photos:

http://oposite.stsci.edu/pubinfo/pictures.html

 

Hubble famous "deep field" page:

http://www.stsci.edu/ftp/science/hdf/hdf.html

 

Nick Strobel's Astronomy Notes:

http://www.astronomynotes.com

  

Skyview - a virtual observatory on the web:

http://skyview.gsfc.nasa.gov/

 

SETI@home:

http://setiathome.ssl.berkeley.edu/

 

Sky and Telescope Magazine home page:

http://www.skypub.com/

 

Astronomy Now Magazine (UK) home page:        

http://www.astronomynow.com/

 

List of the 110 Messier objects:

http://www.seds.org/messier/

 

Gamma Ray Burster Info:

http://gcn.gsfc.nasa.gov/gcn/

 

Galileo spacecraft page:

http://galileo.jpl.nasa.gov/

 

CHANDRA orbiting X-ray telescope info and pics:

http://chandra.harvard.edu    

 

Terraforming info:

http://www.users.globalnet.co.uk/~mfogg/index.htm

 

Constellations info:

http://www.astro.wisc.edu/~dolan/constellations/

 

Asteroid occultation predictions:

http://www.lunar-occultations.com/iota/iotandx.htm

 

Amateur Telescope Makers of Boston:

http://www.atmob.org/

 

"MicroObservatory" telescope:

http://mo-www.harvard.edu/MicroObservatory/

 

Sidereal time calculator:

http://mach.usno.navy.mil/cgi-bin/aa_micaform2?calc=11&ZZZ=END

 

Near Earth Asteroid Tracking (NEAT):

http://neat.jpl.nasa.gov/

 

Impact craters:

http://www.lpi.usra.edu/pub/publications/slidesets/impacts.html

 

U. of Tenn. - Astronomy 161:

http://csep10.phys.utk.edu/astr161/lect/index.html

 

Cornell U. - Astronomy 201:

http://astrosun.tn.cornell.edu/courses/astro201/topics.html

 

NOAA-POES satellite, aurora observer

http://www.sec.noaa.gov/pmap/index.html

 

Planetary atmospheres:

http://www.pha.jhu.edu/~reth/planet2.html

 

Spectroscopy:

http://loke.as.arizona.edu/~ckulesa/camp/camp_spectroscopy.html

 

Jordanian astronomical society data page:

http://www.jas.org.jo/data.html

 

Nine Planets (SEDS, U. of Arizona chapter):

http://www.seds.org/nineplanets/nineplanets/nineplanets.html

 

Great stellar database, easy to use:

http://www.gatter.demon.co.uk/data/stars_list.htm

 

U. of Oregon Pine Mtn. observatory:

http://pmo-sun.uoregon.edu/

 

Distance ladder:

http://www.astro.washington.edu/labs/Distance_Ladder.html