- Chandra X-Ray Observatory 
 
- Compton Gamma Ray Observatory 
 
- Far Ultraviolet Spectroscopic Explorer 
 
- Hubble Space Telescope 
 
- Microwave Anisotropy Probe, studying the Big Bang and the structure of galaxies. 
 
- Origins Program 
 
- ROSAT (turned off February 1999) 
 
- Rossi X-ray Timing Explorer 
 
- Space Science 
 
- Space Infrared Telescope Facility 
 
- Stratospheric Observatory for Infrared Astronomy 
 
- Commercial Remote Sensing Program 
 
- Earth Observer One 
 
- Earth System Science Pathfinder 
 
- GOES Project Science, from U.S. weather satellites in geosynchronous orbit. 
 
- GLOBE -- Graphic representations of Earth science data by students. 
 
- ICESat 
 
- Landsat 7 
 
- Polar Orbiting Environmental Satellites (POES), U.S. weather satellites in polar orbit. 
 
- Sea-Viewing Wide-Field Sensor (SeaWiFS) 
 
- TOPEX/POSEIDON, U.S-French mission to study ocean topography and circulation (includes information on El Niño). 
 
- Total Ozone Mapping Spectrometer (TOMS) Home Page 
 
- Tropical Rainfall Measuring Mission (TRMM) 
 
- Upper Atmosphere Research Satellite (UARS) 
 
- The Space Calendar 
 
- Tour of the Solar System 
 
- NASA Human Spaceflight Web, including the Space Shuttle and International Space Station 
 
- The Space Shuttle Reference Manual, technical descriptions of the spacecraft's systems. 
 
- Asteroid and Comet Impact Hazards 
 
- Cassini 
 
- RTGs, Cassini's nuclear power source. 
  
- Discovery Program, NASA's faster, better, cheaper solar system exploration missions 
 
- Contour Mission, The Comet Nucleus Tour 
 
- Deep Impact will propel a huge copper projectile into the surface of a comet 
 
- Genesis, a mission to collect particles ejected from the Sun 
 
- Lunar Prospector studied the Moon in great detail mission completed July 1999 
 
- Mars Pathfinder put the Sojourner rover on the surface of Mars 
 
- MESSENGER, a scientific investigation of the planet Mercury 
 
- Near-Earth Asteroid Rendezvous (NEAR), the first spacecraft to orbit an asteroid 
 
- Stardust -- NASA's mission to return a sample from a comet to Earth 
  
- Galileo 
 
- Mars Missions, including: 
 
- Near-Earth Asteroid Tracking (NEAT) Home Page 
 
- New Millennium Program's missions will test new systems and instruments in deep space and in orbit around the Earth 
 
- Pioneer, 7 billion miles from Earth (as of February 2000) and counting 
 
- Voyager Project Home Page, billions and billions of miles travelled 
 
- Advanced Composition Explorer (ACE) 
 
- Eclipses 
 
- FAST 
 
- Polar 
 
- SOHO 
 
- Submillimeter Wave Astronomy Satellite 
 
- Thermosphere-Ionosphere-Mesosphere Energetics & Dynamics (TIMED) Explorer 
 
- TRACE 
 
- Ulysses 
 
- Voyager 1 and 2 
 
- Yohkoh 
 
- Reusable Launch Vehicles and Space Transportation Programs 
 
- Robotics Education
  
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