Real Time Satellite site. http://www.n2yo.com/ Very cool way to see where the satellites are.
This web connection shows the real-time position of your choice of Spacecraft, Weather, or Amateur satellites. Information is available about each space craft by clicking on the space craft. You can also get the current time at any latitude and longitude by clicking on the desired spot on the map.
Very useful for satellite information.
"Learn how Satellites transfer valuable information
from Space. Here you will find NASA projects specifically involving Satellite
"Our aim is to provide you with all the information you need to observe satellites such as the International Space Station and the Space Shuttle, spectacular events such as the dazzlingly bright flares from Iridium satellites as well as a wealth of other spaceflight and astronomical information."
These are Earth orbiting satellites. For other planet missions see Solar System page
Kepler - Search for Habitable Planets (exoplanetary) http://www.kepler.arc.nasa.gov/index.html
The main page gives information about this mission. The educational section is run by Lawrence Hall of Science, go here> http://www.lawrencehallofscience.org/kepler/Education-resources.html . The most interesting educational part is the search for planets run by Bridgewater - go here> http://www.bridgewater.edu/departments/physics/ISAW/ExoplanetMain.html.
ACE - Advanced Composition Explorer (solar) http://www.srl.caltech.edu/ACE/
The educational section is at the Cosmic and Heliospheric Learning Center http://helios.gsfc.nasa.gov/ . No lesson plans ore teacher materials here. At least not that I could find with a quick look. This seems to mostly be a reference resource on the Sun, cosmic rays, and spcaeweather.
Chandra (deep space) http://chandra.harvard.edu/index.html
Chandra X-ray Observatory has been NASA's flagship mission for X-ray astronomy, taking its place in the fleet of "Great Observatories." Education Site: http://chandra.harvard.edu/edu/
Spitzer Space Telescope http://www.spitzer.caltech.edu/
During its 2.5-year mission, Spitzer will obtain images and spectra by detecting the infrared energy, or heat, radiated by objects in space between wavelengths of 3 and 180 microns. Education site: Cool Cosmos http://coolcosmos.ipac.caltech.edu/ Nicely done site with Classroom activities and online lessons.
Hubble Space Telescope http://hubblesite.org/
Lots of Hubble Telescope information and images. A "Fun and Games" section. Amazing Space http://amazing-space.stsci.edu/ seems to be the Hubble education site.
SOHO Solar and Heliospheric Observatory http://sohowww.nascom.nasa.gov/
Solar observing satellite. Education page here: http://sohowww.nascom.nasa.gov/
GALEX Galaxy Evolution Explorer http://www.galex.caltech.edu/
An orbiting space telescope that will observe galaxies in ultraviolet light across 10 billion years of cosmic history. Education page is still under construction as of 1/2006.
TRIMM Tropical Rainfall Measuring Mission http://trmm.gsfc.nasa.gov/
IMAGE http://image.gsfc.nasa.gov/. Education site: http://image.gsfc.nasa.gov/poetry/