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NASA History

Provides information about asteroids of the Aten, Apollo and Amor groups and periodic comets. In English and Russian.

AstroGuard -- dedicated to the preservation of life on Earth, through advance warning of asteroid or cometary impact

PDS archives, and distributes digital data from past, and present NASA planetary missions, astronomical observations, and laboratory measurements. Contains data and ...

Electronic book with technical information about the sun and the solar system.

Research in the planetary system, stellar atmospheres, the Milky Way galaxy, extragalactic astronomy, and observational astronomy.

Astronomy, Solar system, Weather and Nature observatory

HowStuffWorks explains thousands of topics, from engines to lock-picking to ESP, with video and illustrations so you can learn how everything works.