- 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.
- 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.
- 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.
- 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 Robotics
- Rover and telerobotics program overview, robotic vehicles, NASA research tasks.
- JPL Multimission Image Processing System
- Mars Society of Caltech/JPL
- Comet Shoemaker-Levy
- Chronicling the July 16-22, 1994, collision of Comet Shoemaker-Levy 9 with Jupiter.
- 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.
- Space Exploration Post 509
- Organization that provides students a hands-on experience in science, engineering, and technology.
- 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.
- JPL News
- Offers their current, as well as archives of their past, news releases.
- Data Distribution Laboratory
- Offers products and services to the JPL community.
- 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.
- JPL Space Very Long Baseline Interferometry Project
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