"Users can find information about a particular satellite; identify sets of satellites having a common characteristic, such as altitude or mission; and sort or aggregate data about the whole population of satellites. Users can quickly answer questions such as
--How many satellites does a given country have in orbit, and what are they used for?
--How many satellites are used for military purposes versus commercial purposes?
--Which countries have earth-observing satellites?
--At what altitudes do most satellites orbit?
For example, the database allows a user to determine the relative numbers of military and non-military satellites operated by the United States and other countries, as is illustrated in the figure below.

http://www.ucsusa.org/global_security/space_weapons/satellite_database.html
| Union of Concerned Scientists