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SIMBAD Astronomical Database
Brings together basic data, cross-identifications, observational measurements, and bibliography, for celestial objects outside the solar system: stars, galaxies, and nonstellar objects within our galaxy, or in external galaxies.
http://simbad.u-strasbg.fr/Simbad
(Added: 12/26/00))
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Space Time Mass
The fabric of space-time is another state of matter and hence it has equivalent mass. The missing mass of the Universe is in the space-time itself that fills the cosmos.
http://www.space-time-mass.com/
(Added: 12/26/00))
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