- NASA Jet Propulsion Laboratory (JPL)
 - Managed by the California Institute of Technology, is NASA's lead centre for robotic exploration of the solar system. - Comet Observation Page
- Includes recent news, observations, and images of comets. Also provides some generally accepted definitions for terms related to cometary astronomy.
- Comet Shoemaker-Levy
- Chronicling the July 16-22, 1994, collision of Comet Shoemaker-Levy 9 with Jupiter.
- Data Distribution Laboratory
- Offers products and services to the JPL community.
- GPS Networks and Ionospheric Systems Development
- Project hosted by NASA Jet Propulsion laboratory with site featuring ionospheric model and maps, ionospheric research and development, and related links.
- Imaging Radar
- International GPS Service
- Supports researchers who use satellites in the U.S. Defence Department's Global Positioning System (GPS) for studies in geodynamics.
- JPL Multimission Image Processing System
- JPL News
- Offers their current, as well as archives of their past, news releases.
- JPL Polar Oceanography Group
- Studies climate-induced variability in sea-ice and land-ice on seasonal to interannual time scales using satellite microwave remote sensing and in-situ data.
- JPL Robotics
- Rover and telerobotics program overview, robotic vehicles, NASA research tasks.
- JPL Space Very Long Baseline Interferometry Project
- Mars Society of Caltech/JPL
- Planetary Data System (PDS) (2)
- Learn about the Planetary Data System (PDS), the archive which stores and distributes digital data from past and present NASA planetary missions, astronomical observations, and laboratory measurements. Sites feature planetary photojournal, image atlas, image node, data community, and data search services.
- Scatterometry Projects, NSCAT and SeaWinds
- Intended for long term study of subjects such as the global climate, weather changes, air-sea interaction, and the water cycle.
- Solar System Dynamics
- Generates accurate position and velocity histories (ephemerides) for the bodies of the solar system including the planets, natural satellites, comets, and asteroids.
- Space Exploration Post 509
- Organization that provides students a hands-on experience in science, engineering, and technology.
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