Alexey Leonov and Voskhod 2

ВО ИМЯ МИРА И ПРоГРЕССА!
(Peace and Progress!)

The back is written in Russian and in English.  The English words are:

In the Name of Peace and Progress!
1965

The sender writes that Voskhod 2 was a Soviet manned space mission March (18th-19th) 1965.  It established another milestone in space exploration when Alexey Leonov became the first person to leave the spacecraft in a specialized spacesuit to conduct a 12 minute 'Spacewalk'.

This is a reproduction postcard that is postmarked in 2015. 

Apollo-Soyuz Insignia / Emblem - Joint US / USSR,

John F. Kennedy Space Center
N.A.S.A.

The official emblem of the joint U.S. / USSR space mission. The Apollo-Soyuz Test Project will be carried out by a Soviet Soyuz space-craft and a U.S. Apollo spacecraft, which will rendezvous and dock in orbit.

Color Photo by NASA

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The Apollo–Soyuz Test Project (ASTP), conducted in July 1975, was the first joint U.S.–Soviet space flight, and the last flight of an Apollo spacecraft.  It marked the end of the Space Race between the two superpowers that began in 1957.

A Monument to Space Conquerors in Russia

The Monument to "Space Conquerors" was erected in 1964 in honor of The first artificial Earth satellite launching.  The monument is situated on the Alley of Space Heroes.
The architects M. Barsch and A. Kolchin,
sculptor A. Faidysh-Krandievskiy.

State institution of culture of Moscow

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The monument is 110 meters (360.9 feet) tall, has 77° incline, and is made of titanium. The Memorial Museum of Cosmonautics is located inside the base of the monument.

Russian Cosmonaut Yuri Gagarin

archive photo
design & reprint by kalashnikova
1961 - 2011

Although it is not printed on the postcard, (except in Russian on the stamp) this is Russian Cosmonaut Yuri Gagarin.

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Yuri Alekseyevich Gagarin (March 9, 1934 – March 27, 1968) was a pilot and cosmonaut. He was the first human being to journey into outer space, when his Vostok spacecraft completed an orbit of the Earth on April 12, 1961.

Russian: 12 Апреля - дЕнь Космонавтики

12 Апреля - дЕнь Космонавтики
12 April - Day of Cosmonautics

This postcard was printed in 1978.

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Cosmonautics Day is a holiday celebrated in Russia and some other former USSR countries on April 12. However since April 7, 2011 it was declared as 'The International Day of Human Space Flight'.  The holiday is in dedication of the first manned space flight made on April 12, 1961 by the 27 year old Russian Soviet cosmonaut Yuri Gagarin. Gagarin circled the Earth for 1 hour and 48 minutes aboard the Vostok 1 spacecraft.