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First nuclear explosion in Mexico
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The U.S. deployed the very first Atomic bombs on the the Japanese cities of Hiroshima and Nagasaki
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A group of scientists led by Edward Teller supported its development. In 1950, President Harry S. Truman announced work on the hydrogen bomb was to continue.
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The first launch took place on May 15, 1957 and led to an unintended crash 400 km (250 mi) from the site. The first successful test followed on 21 August 1957; the R-7 flew over 6,000 km (3,700 mi) and became the world's first ICBM.
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First Intercontinental Ballistic Missle
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First signals from space.
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The dogs name was Laika and she was the first dog in space.
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Beginning to the next steps to getting ahead of the USSR in the space race.
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First communications satellite
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-First lunar spacecraft -First detection of solar wind
-First rocket engine restart in earth orbit -
First object in heliocentric orbit
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First Weather satellite
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First satellite in polar orbit.
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First spy satellite t carry a camera
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First photograph of earth
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First impact into another celestial body(The Moon)
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First photos of the far side of the moon
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First successful spy satellite
(returned intelligence data) -
First animals and plants returned alive from space
(Belka&Strelka) -
Alan Shepard- first human controlled space flight
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First crewed mission lasting a full day
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Yuri Gargarin-First human space flight
First orbital flight in man made vehicle -
First active communications satellite
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First spacecraft to land/impact on the far side of the moon
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In 1962, the Soviets had only 20 ICBMs capable of delivering nuclear warheads to the US from inside the Soviet Union.