|
Search over 100 encyclopedias and dictionaries: |
Research categories | Follow us on Twitter |
Research categories
View all topics in the newsView all reference sources at Encyclopedia.com |
|||
|
|
communications satellite
communications satellite artificial satellite that functions as part of a global radio-communications network. Echo 1, the first communications satellite, launched in 1960, was an instrumented inflatable sphere that passively reflected radio signals back to earth. Later satellites carried with... Read more |
|
Communications Satellite Corp
Communications Satellite Corporation (Comsat), organization incorporated (1962) by an act of Congress to establish a commercial system of international communications using artificial satellites. Although government sponsored, it was financed by a public stock issue. The launching in 1965 of its... Read more |
|
Satellite Dish
Satellite Dish Background A satellite dish is a parabolic television antenna that receives signals from communication satellites in orbit around the earth. Its sole function is to provide the television viewer with a wider variety of channels. The first communications... Read more |
|
|
artificial satellite
artificial satellite object constructed by humans and placed in orbit around the earth or other celestial body (see also space probe ). The satellite is lifted from the earth's surface by a rocket and, once placed in orbit, maintains its motion without further rocket propulsion. The first... Read more |
|
|
reconnaissance satellite
reconnaissance satellite artificial satellite launched by a country to provide intelligence information on the military activities of foreign countries. There are four major types. Early-warning satellites detect enemy missile launchings. Nuclear-explosion detection satellites are designed to... Read more |
|
|
weather satellite
weather satellite artificial satellite used to gather data on a global basis for improvement of weather forecasting. Information includes cloud cover, storm location, temperature, and heat balance in the earth's atmosphere. The first weather satellites in the United States were those of the Tiros... Read more |
|
Reconnaissance
Reconnaissance The first military space mission was reconnaissance, and that remains the most important mission, offering capabilities that cannot be obtained by any other means. A number of countries possess military satellite reconnaissance systems, including the United... Read more |
|
Satellite
Satellite In astronomy , a satellite refers to any object that is orbiting another larger, more massive object under the influence of their mutual gravitational force. Thus, any planetary moon (e.g., the Moon revolving about Earth) is properly described as a satellite of that planet. Because... Read more |
|
Search and Rescue
Search and Rescue Commercial search and rescue missions to retrieve and repair valuable satellites may become commonplace in the twenty-first century. Telecommunications companies and other businesses typically spend between $50 million and $300 million to manufacture and... Read more |
|
Inmarsat
Inmarsat, abbreviation for the International Mobile Satellite Organization, which was formed by a convention of the International Maritime Organization in 1975, and began operations in 1982. Inmarsat's obligations to provide maritime distress and safety services via satellite were part of the 1988... Read more |
|
|
New research on polar research from M.P. Heidejorgensen and co-authors...
...a male narwhal (Monodon monoceros) was instrumented with a satellite transmitter...group of narwhals taken from...This resighting confirms...observed for narwhals from previous...Arctic ... |