http://w3.one.net/~rback/frames.html
Phases of the Moon

http://praxis.pha.jhu.edu/hut.html

Hopkins Ultraviolet Telescope

http://www.gsfc.nasa.gov/astro/iras/iras_home.html

IRAS

http://www.stsci.edu/public.html

Hubble Space Telescope pictures and information about the telescope. (2)

http://www.noao.edu/noao.html

Information about the National Optical Observatories (Kitt Peak, for example)

http://http.hq.eso.org/eso.homepage.html

Information about the European Southern Observatory

http://info.aoc.nrao.edu

Information about the National Radio Astronomy Observatory

http://www.mpifr-bonn.mpg.de/effberg.html

Effelsberg Radio Telescope

http:// www.tuc.nrao.edu/

NRAO/National Radio Astronomy Observatory

http://www.nrao.edu/

National Optical Astronomy Observatory

http://argo.tuc.noao.edu/

National Solar Observatory

http://www.seds.org/~spider/oaos/oaos.html

Orbiting Telescopes

http://www.rosat.mpe-garching.mpg.de/

ROSAT Satellite

http://heasarc.gsfc.nasa.gov/docs/rosat/rosat3.html

Roentgen Satellite

http://www.cchem.berkeley.edu/ChemResources/temperature.html Temperature Conversion Calculator

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

SkyView Virtual Observatory

http://physics7.berkeley.edu/darkmat/dopplershift.html

Doppler Shift Tutorial

http://www.gsfc.nasa.gov/education/curricula/invisible.html

Invisible Light

http://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/grbhist.html

A Brief History of the Discovery of Cosmic Gamma-Ray Bursts

http://heasarc.gsfc.nasa.gov/docs/heasarc/headates/heahistory.html

History of High Energy Astrophysics

http://www.cs.brown.edu/research/graphics/research/illus/spectrum/

Java-based Interactive Illustrations of Color Perception!

http://www.physics.ucla.edu/~dauger/fresnel/

Fresnel Diffraction

http://sd-www.jhuapl.edu/NEAR/Education/lessonSpectrum/lpspec.html

Lesson Plan on the Electromagnetic Spectrum

http://www.pbs.org/deepspace/hubble/index.html

Everything You Wanted to Know About the Hubble Telescope, But Were Afraid to Ask

http://www.darksky.org/~ida/info28.html

An Introduction to Light Pollution

http://cfa-www.harvard.edu/cfa/ps/nelpag.html

The New England Light Pollution Advisory Group

http://www.eso.org/aot/introduction.html

What is Adaptive Optics?

http://southport.jpl.nasa.gov/desc/imagingradarv3.html

What is Imaging Radar?

http://www.eia.brad.ac.uk/rti/

The Bradford Robotic Telescope

http://www.stsci.edu/pubinfo/Pictures.html/

Hubble Space Telescope

http://www.noao.edu/kpno/kpno.html

Kitt Peak National Observatory

http://www.mrao.cam.ac.uk/telescopes/coast

COAST

http://heasarc.gsfc.nasa.gov/xte_weather/

XTE Monitoring Project

http://deepspace.jpl.nasa.gov/dsn/index.html

Deep Space Network

http://www.stsci.edu/top.html

Space Telescope Science Institute

http://wet.iitap.iastate.edu

Whole Earth Telescope

http://www.seds.org/billa/bigeyes.html

The World's Largest Optical Telescopes

http://www.mtwilson.edu/

Mount Wilson Observatory's website has more than just resources for observers. Their site includes history, outreach, services, and lots more.

http://inferno.physics.uiowa.edu/

University of Iowa's Automated Telescope Facility (ATF)

http://ngst.gsfc.nasa.gov

Next Generation Space Telescope

http://www.fisk.edu/vl/astro/observatories.html

WWW Virtual Library Astronomical Observatories Page maintains the most complete, up-to-date list of Radio, Optical, Space, Solar, Cosmic Ray, Gamma Ray, and Neutrino Observatories in the World

http://ranier.oact.hq.nasa.gov/Sensors_page/GroundObserv.html

Ground-based Solar and Astrophysical Observatory Guide

http://www.eia.brad.ac.uk/rti/automated.html

Automated Telescopes on the Internet

http://freenet.buffalo.edu/comp/space/scope.resources

Amateur Telescope Maker's Resource List

http://ranier.oact.hq.nasa.gov/Sensors_page/MissionLinks.html

Instrument and Sensing Technology Space Mission Acronym List and Hyperlink Guide

http://stdatu.stsci.edu

The Hubble Data Archive, a WWW distribution center for data from the Hubble Space Telescope and the VLA FIRST Survey.