A public utility is a company that maintains the infrastructure for a public service. Public utilities often involve natural monopolies, and as a result are often government monopolies, or if privately owned, treated as specially regulated sectors. Public utilities can be privately owned or publicly owned. Publicly owned utilities include cooperative and municipal utilities. Municipal utilities may actually include territories outside of city limits or may not even serve the entire city. Cooperative utilities are owned by the customers they serve. They are usually found in rural areas. Private utilities, also called investor owned utilities, are owned by investors. Unlike public companies, private utilities may be listed on the stock exchange. Private, in this context, means not owned by the public or the government.
In poorer developing countries, public utilities are often limited to wealthier parts of major cities, as used to be the case in developed countries in the nineteenth century.
Examples of utilities are:

ADC - Astronomical Data Center - NASA's ADC is a resource for astronomical data, catalogs, and journal tables. Effective October 1 2002, NASA is directing ADC users to the sites listed below that provide similar services. Maintenance and updating of the ADC's Web site and services will be discontinued.
Meta Description: [ ADC is a resource for astronomical data, catalogs, and journal tables ]
CASI Technical Report Server - The CASI TRS database contains bibliographic citations and abstracts for publicly available aerospace documents, journal articles, and conference proceedings. It is part of the NASA Technical Report Server (NTRS).
Compton Gamma Ray Observatory - CGRO Science Support Center;search HEASARC Archives, Software Tools for photos, information, and updated status reports on the space observatory and projects.
Meta Description: [ The Gamma-ray Large Area Space Telescope (GLAST) ]
GeoCover Landsat - Welcome to the world of the Landsat Satellites and their view of the Earth we live on!
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IRSA - The archive node for scientific data sets from NASA's infrared and sub-millimeter astronomy projects and missions.
JPL Technical Reports Server - Features a large searchable repository of reports on space technology.
MSFC Liftoff Orbital Viewer - NASA java viewer of a vast number of space objects orbital paths.
NASA Acquisition Internet Service (NAIS) - A World-Wide Web (WWW) service, from which industry has immediate access to current NASA acquisition information over the Internet. The NAIS is a collection of on-line servers operated at each NASA field installation, and all are interconnected to ease the vendor's access to all NASA acquisitions.
NASA TechFinder - Search an up to date database of all NASA programs, technologies and success stories which may have commercial potential and benefits.
NASA Technical Report Server (NTRS) - The NASA Technical Report Server is an experimental service that allows users to search the many different abstract and technical report servers maintained by various NASA centers and programs.
NASA Thesaurus - Authorized subject terms by which the documents in the NASA STI Databases are indexed and retrieved.
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NASA's Scientific and Technical Information - Helps you find NASA aerospace STI, as well as locate domestic and international STI pertinent to NASA's missions and Strategic Enterprises.
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NASA/KSC Media Resources - Shuttle Launch Schedule
NED - NASA/IPEC Extragalactic Database.It is built around a master list of extragalactic objects for which cross-identifications of names have been established, accurate positions and redshifts entered to the extent possible, and some basic data collected.
Meta Description: [ The NASA/IPAC Extragalactic Database (NED) provides a
multi-wavelength fusion of data for millions of objects outside the Milky Way galaxy.
The astrophysical objects covered in NED include galaxies, quasars and other
active galactic nuclei (AGNs), gravitational lenses, absorption line systems, ... ]
Planetary Data System - PDS archives and distributes scientific data from NASA planetary missions, astronomical observations, and laboratory measurements. The PDS is sponsored by NASA's Office of Space Science.
Meta Description: [ This website serves as a mechanism
for subscribing to data, software and documentation from the PDS. ]
The Disaster Finder - A search service provided by th NASA Solid Earth and Natural Hazards Program.This service was created for the disaster community at-large so that the best links in disaster information could be found quickly and easily.
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XML Astronomy Archive at NASA - GSFC/NASA XML Project. The data products in the XML archive are captured in the ADC Dataset XML standard and are the result of a multi-year project to translate both existing and incoming data into an XML format from an older ReadMe ASCII standard.
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