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see satellite, artificialsatellite, artificial,
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.
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; space explorationspace exploration,
the investigation of physical conditions in space and on stars, planets, and other celestial bodies through the use of artificial satellites (spacecraft that orbit the earth), space probes (spacecraft that pass through the solar system and that may or may not
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(spût -nik) Any of a series of Soviet artificial satellites, the first of which – Sputnik 1 – was the first spacecraft to be placed in orbit. This 58-cm diameter sphere, weighing 84 kg, was launched on Oct. 4 1957; it burnt up in the Earth's atmosphere 92 days later. The orbit had a period of 96 minutes, an apogee and perigee (highest and lowest altitudes) of about 950 km and 230 km, and was inclined at 65° to the equator. Its radio signals were transmitted every 0.6 seconds. It contained few instruments, being intended as a test vehicle. The launching of Sputnik 1 had a profound effect in accelerating America's space program.

Sputnik 2, launched on Nov. 3 1957, was very much bigger. It carried about 500 kg in payload, including a live dog, Laika, which survived the launch, as well as 10 experiments. Sputnik 3, launched on May 15 1958, weighed about 1330 kg and remained in orbit for 691 days.

References in periodicals archive ?
Earlier, RT America and Sputnik Radio's partner Reston Translator that rebroadcasts radio programs had to register as a foreign agent in the United States under the FARA, after Justice Department's request.
However, Sputnik later admitted that the information concerning the escape to Poland was untrue.
San Francisco-based Twittersaid in an unsigned statement on its website that election meddling is "not something we want" on the social network and that it had also done its own investigations of RT and Sputnik.
Senator Shaheens Foreign Agents Registration Modernization and Enforcement Act gives the Department of Justice broader authority to compel organizations like Sputnik, RT America and others to produce documentation on funding sources and foreign connections.
While not a simple, straightforward book, readers who take the time to explore Earth with Prez, Sputnik and Granddad will be rewarded with joy, laughter and the knowledge that it might actually be possible to find your own place in the universe.
Sputnik Planitia is the western half of a larger, heart-shaped bright feature nicknamed Tombaugh Regio that's situated on the hemisphere facing away from the big moon Charon.
Prez's uncertainty of his place in the world makes him hugely endearing, and Sputnik, a kind of beneficent Lord of Misrule (happy to put a lightsabre into the hands of a five year old or deploy a reverse dynamite grenade to rebuild Hadrian's Wall), is a fantastic character able to fill the page with joy and adventure.
Sputnik you may have forgotten, is the investigatory news operation that took one look at the count of the Scottish referendum at the Royal Highland Showground and concluded the vote had been fixed.
Sputnik is part of the Russian state information agency Rossiya Segodnya, headed by Dmitry Kiselyov who has been included in the European Union's sanctions list following his propaganda supporting Russia's incursion into Ukraine.
10 (PNA/Sputnik) -- The US sending a spy plane to Singapore is a calculated attempt to warn China that it does not have unrestricted privileges to operate in international waters, former CIA officer Larry Johnson told Sputnik on Wednesday.
M2 EQUITYBITES-October 12, 2015-Sport Venture Group Acquires Stake in "Football Company" Sputnik Enterprises