Panier Recherches : timbres, enveloppes.

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Here are details about a :
Space commemorative cover
or Space Cover.

Kosmodrom / Ort : Baikonur

Stempeldatum: 20 Déc. 1968
Ereignisart : Start
Startrampe / Ort : Russland Plessezk
Bemannte / Robotische Mission : Robotisch
Missionsziel/-typ : Experimentell / Wissenschaft

SCIENCE

ou?/where?: au sol - ground
autographe?: non - none

Beschreibung : Cosmos 261 carried an experiment to study (1) geoactive corpuscles-electrons and protons that are the cause of the northern lights, (2) electrons of super-thermal energy, and (3) changes in the density of the upper layers of the earth`s atmosphere during northern lights. This experiment was a joint effort of research institutions and observations of the People`s Republic of Bulgaria, the Hungarian People`s Republic, the German Democratic Republic, the Polish People`s Republic, the Romainian Socialist Republic, The Soviet Union, and the Czechoslovak Socialist Republic.

Schlüsselwort/-wörter :
#Planet,
#Satellit,

Ist AUSSERHALB der Weltraum-Revuen.

Letzte Änderung: 26/04/2023 @ 13h23