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Iridium Communications Inc. (formerly Iridium Satellite LLC) is a publicly traded American company headquartered in McLean, Virginia, United States. Iridium operates the Iridium satellite constellation , a system of 80 satellites: 66 are active satellites and the remaining fourteen function as in-orbit spares. [ 2 ]
The Iridium system was designed to be accessed by small handheld phones, the size of a cell phone. While "the weight of a typical cell phone in the early 1990s was 10.5 ounces" [6] (300 grams) Advertising Age wrote in mid 1999 that "when its phone debuted, weighing 1 pound (453 grams) and costing $3,000, it was viewed as both unwieldly and expensive."
A bright artificial satellite flare is visible above the Very Large Telescope.Satellite constellations could have an impact on ground-based astronomy. [1]Satellites in medium Earth orbit (MEO) and low Earth orbit (LEO) are often deployed in satellite constellations, because the coverage area provided by a single satellite only covers a small area that moves as the satellite travels at the high ...
First generation late 1990s Iridium satellite phone Globalstar GSP-1600 satellite phone Satellite phone in use in Nias, Indonesia, in April 2005 after the Nias–Simeulue earthquake A satellite telephone , satellite phone or satphone is a type of mobile phone that connects to other phones or the telephone network by radio link through ...
Satellite flare, also known as satellite glint, is a satellite pass visible to the naked eye as a brief, bright "flare".It is caused by the reflection toward the Earth below of sunlight incident on satellite surfaces such as solar panels and antennas (e.g., synthetic aperture radar).
Flashes created by the tumbling main body of the Iridium 33 wreckage The collision resulted in significant debris in low Earth orbit. (2011) (2011) NASA , the U.S. space agency, initially estimated ten days after the collision that the satellite space incident had created at least 1,000 pieces of debris larger than 10 cm (4 in), in addition to ...
Globalstar satellites are simple "bent pipe" analog repeaters, [11] unlike Iridium. [12] A network of ground gateway stations provides connectivity from the 40 satellites to the public switched telephone network and Internet. A satellite must have a Gateway station in view to provide service to any users.
AlphaGo versus Lee Sedol, also known as the DeepMind Challenge Match, was a five-game Go match between top Go player Lee Sedol and AlphaGo, a computer Go program developed by DeepMind, played in Seoul, South Korea between 9 and 15 March 2016.