- (1866) Sisyphus
 - Orbital data for (1866) Sisyphus, the near-Earth asteroid. - 99942 Apophis (2004 MN4) Earth Impact Risk Summary
- Features a NASA Near Earth Object Programme summary table that includes basic information about the hazard for the object, 99942 Apophis.
- Asteroid Radar Research
- Provides an overview of the JPL and California Institute of Technology projects and facilities dedicated to tracking asteroids.
- Asteroid Watch - JPL NASA
- Learn about NASA-sponsored efforts to detect, track, and characterize potentially hazardous asteroids and comets that could approach the Earth.
- Asteroids - Sky & Telescope
- Articles and observing guides for asteroids, the rocky little worlds that can be fascinating to track down.
- Bill Bottke's Asteroid Research
- Web page sharing facts about asteroids including how they are formed, how they evolve, and what they are made of. By Bill Bottke, a research scientist with the Department of Space Studies, Southwest Research Institute.
- FAIR: Future Asteroid Interception Research
- Funding for asteroid, NEO, and NEA research projects.
- Friday the 13th, 2029
- Read about how Asteroid 2004 MN4 will come scarily close to Earth on Friday, April 13, 2029, typically considered an unlucky day. Also listen to Dr. Tony Phillips of Science@NASA talk about the occurence.
- Near-Earth Asteroid Tracking (NEAT)
- Project to autonomously search for near-Earth and Earth-crossing asteroids using a computer controlled telescope, a CCD camera, and NEAT software.
- Nine Planets: Asteroids
- Guide to how asteroids are classified according to their spectra and position in the solar system.
- NOVA: Doomsday Asteroid
- Introduction to the brilliant Hale-Bopp and Hyakutake comets.
- NSSDC: Asteroids
- Collection of asteroid fact sheets, images, and mission information from NASA.
- Science @ NASA: Caveat Impactor
- Why an asteroid with almost no chance of hitting Earth made big headlines.
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