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- Kosmos_21 abstract "Kosmos 21 (Russian: Космос 21 meaning Cosmos 21) was a Soviet spacecraft with an unknown mission. This mission has been tentatively identified by NASA as a technology test of the Venera series space probes. It may have been an attempted Venus flyby, presumably similar to the later Kosmos 27 mission, or it may have been intended from the beginning to remain in geocentric orbit. In any case, the spacecraft never left Earth orbit after insertion by the SL-6/A-2-e launcher. The orbit decayed on November 14, three days after launch.Cosmos 21 was launched at 06:23:35 UTC on 11 November 1963, atop a Molniya 8K78 carrier rocket flying from Site 1/5 at the Baikonur Cosmodrome. Its original development name before being given the Cosmos 21 denomination once it reached orbit was 3MV-1 No. 1.Beginning in 1962, the name Kosmos was given to Soviet spacecraft which remained in Earth orbit, regardless of whether that was their intended final destination. The designation of this mission as an intended planetary probe is based on evidence from Soviet and non-Soviet sources and historical documents. Typically Soviet planetary missions were initially put into an Earth parking orbit as a launch platform with a rocket engine and attached probe. The probes were then launched toward their targets with an engine burn with a duration of roughly 4 minutes. If the engine misfired or the burn was not completed, the probes would be left in Earth orbit and given a Kosmos designation.".
- Kosmos_21 cosparId "1963-044A".
- Kosmos_21 wikiPageID "83221".
- Kosmos_21 wikiPageLength "3247".
- Kosmos_21 wikiPageOutDegree "23".
- Kosmos_21 wikiPageRevisionID "586338658".
- Kosmos_21 wikiPageWikiLink 3MV-1.
- Kosmos_21 wikiPageWikiLink Baikonur_Cosmodrome.
- Kosmos_21 wikiPageWikiLink Category:1963_in_the_Soviet_Union.
- Kosmos_21 wikiPageWikiLink Category:Kosmos_satellites.
- Kosmos_21 wikiPageWikiLink Category:Spacecraft_launched_in_1963.
- Kosmos_21 wikiPageWikiLink Category:Spacecraft_which_reentered_in_1963.
- Kosmos_21 wikiPageWikiLink Category:Venera_program.
- Kosmos_21 wikiPageWikiLink Gagarins_Start.
- Kosmos_21 wikiPageWikiLink Geocentric_orbit.
- Kosmos_21 wikiPageWikiLink Kosmos_(satellite).
- Kosmos_21 wikiPageWikiLink Kosmos_27.
- Kosmos_21 wikiPageWikiLink Low_Earth_orbit.
- Kosmos_21 wikiPageWikiLink Molniya_(rocket).
- Kosmos_21 wikiPageWikiLink Parking_orbit.
- Kosmos_21 wikiPageWikiLink S.P._Korolev_Rocket_and_Space_Corporation_Energia.
- Kosmos_21 wikiPageWikiLink Serial_code.
- Kosmos_21 wikiPageWikiLink Venera.
- Kosmos_21 wikiPageWikiLink Venus.
- Kosmos_21 wikiPageWikiLinkText "Kosmos 21".
- Kosmos_21 apsis "gee".
- Kosmos_21 cosparId "1963".
- Kosmos_21 decayDate "1963-11-14".
- Kosmos_21 launchDate "--11-11".
- Kosmos_21 launchRocket Serial_code.
- Kosmos_21 launchRocket "G103-18".
- Kosmos_21 launchRocket "Molniya 8K78M".
- Kosmos_21 launchSite Baikonur_Cosmodrome.
- Kosmos_21 launchSite Gagarins_Start.
- Kosmos_21 manufacturer S.P._Korolev_Rocket_and_Space_Corporation_Energia.
- Kosmos_21 missionType "Venus flyby?".
- Kosmos_21 name "Kosmos 21".
- Kosmos_21 orbitReference Geocentric_orbit.
- Kosmos_21 orbitRegime Low_Earth_orbit.
- Kosmos_21 spacecraftType "3".
- Kosmos_21 wikiPageUsesTemplate Template:Citation_needed.
- Kosmos_21 wikiPageUsesTemplate Template:End-date.
- Kosmos_21 wikiPageUsesTemplate Template:Infobox_spaceflight.
- Kosmos_21 wikiPageUsesTemplate Template:Lang-ru.
- Kosmos_21 wikiPageUsesTemplate Template:Orbital_launches_in_1963.
- Kosmos_21 wikiPageUsesTemplate Template:Refimprove.
- Kosmos_21 wikiPageUsesTemplate Template:Reflist.
- Kosmos_21 wikiPageUsesTemplate Template:Start-date.
- Kosmos_21 wikiPageUsesTemplate Template:USSR-spacecraft-stub.
- Kosmos_21 wikiPageUsesTemplate Template:Venera.
- Kosmos_21 subject Category:1963_in_the_Soviet_Union.
- Kosmos_21 subject Category:Kosmos_satellites.
- Kosmos_21 subject Category:Spacecraft_launched_in_1963.
- Kosmos_21 subject Category:Spacecraft_which_reentered_in_1963.
- Kosmos_21 subject Category:Venera_program.
- Kosmos_21 hypernym Spacecraft.
- Kosmos_21 type ArtificialSatellite.
- Kosmos_21 type CelestialBody.
- Kosmos_21 type Place.
- Kosmos_21 type Satellite.
- Kosmos_21 type Mission.
- Kosmos_21 type Location.
- Kosmos_21 type Place.
- Kosmos_21 type Thing.
- Kosmos_21 comment "Kosmos 21 (Russian: Космос 21 meaning Cosmos 21) was a Soviet spacecraft with an unknown mission. This mission has been tentatively identified by NASA as a technology test of the Venera series space probes. It may have been an attempted Venus flyby, presumably similar to the later Kosmos 27 mission, or it may have been intended from the beginning to remain in geocentric orbit. In any case, the spacecraft never left Earth orbit after insertion by the SL-6/A-2-e launcher.".
- Kosmos_21 label "Kosmos 21".
- Kosmos_21 sameAs Q1078290.
- Kosmos_21 sameAs كوزموس_21.
- Kosmos_21 sameAs Космос_21.
- Kosmos_21 sameAs Kosmos_21.
- Kosmos_21 sameAs Cosmos_21.
- Kosmos_21 sameAs Koszmosz–21.
- Kosmos_21 sameAs コスモス21号.
- Kosmos_21 sameAs Kosmos-21.
- Kosmos_21 sameAs Космос-21.
- Kosmos_21 sameAs Kosmos_21.
- Kosmos_21 sameAs Kosmos_21.
- Kosmos_21 sameAs Cosmos_21.
- Kosmos_21 sameAs m.0lb8d.
- Kosmos_21 sameAs Космос-21.
- Kosmos_21 sameAs Kosmos-21.
- Kosmos_21 sameAs Kosmos-21.
- Kosmos_21 sameAs Космос-21.
- Kosmos_21 sameAs Q1078290.
- Kosmos_21 sameAs 金星2D號.
- Kosmos_21 wasDerivedFrom Kosmos_21?oldid=586338658.
- Kosmos_21 isPrimaryTopicOf Kosmos_21.