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It was when Sputnik 1 was the first thing that orbit the earth until 1/4/1958
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Explorer 1, the first U.S. satellite in orbit, lifts off at Cape Canaveral using a modified ABMA-JPL Jupiter-C rocket. It carries a scientific experiment of James A. Van Allen, and discovers the Earth's radiation belt.
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Explorer 2 is launched by a Jupiter-C rocket, and fails to reach orbit.
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Sputnik 3 is launched by the U.S.S.R.
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sputnick 2 had a dog named lakia for 7 days in its orbit until April 13 1958
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Luna 2 is launched, impacting on the moon on September 13 carrying a copy of the Soviet coat of arms, and becoming the first man-made object to hit the moon
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Luna 3 translunar satellite is launched, orbiting the moon and photographing 70 percent of the far side of the moon.
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The first space walk is made from Soviet Voskhod 2 by Cosmonaut Alexei A. Leonov. Duration is 12 minutes long.
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Edward White II makes the first U.S. space walk from Gemini 4. Duration is 22 minutes.
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Soviet Venus 3 is launched, becoming the first craft to impact Venus on March 1, 1966.
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Soviet Luna 9 is the first spacecraft to soft-land on the moon
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U.S. Lunar Orbiter 1 enters moon orbit, and takes the first picture of the Earth from the distance of the moon.
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Neil Armstrong and Edwin Aldrin, Jr. make the first manned soft landing on the Moon, and the first moonwalk, using Apollo 11.
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Soviet Venera 3 impacts on Venus, the first spacecraft to reach another planet. It fails to return data
