Portal:Spaceflight/On This Day/4 April

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• 1964 - A Vostok rocket launches the Kosmos-28 satellite.
• 1967 - A Vostok rocket launches the Kosmos-153 satellite.
• 1968 - A Saturn V launches the Apollo 6 spacecraft.
• 1969 - A Voskhod rocket launches the Kosmos-276 satellite.
• 1969 - A Kosmos-2I launches the Kosmos-277 satellite.
• 1971 - A Tsyklon-2 launches the Kosmos-404 satellite.
• 1972 - A Molniya-M launches a Molniya-1 satellite.
• 1974 - A Voskhod rocket launches the Kosmos-639 satellite.
• 1978 - A Soyuz-U launches the Kosmos-1001 satellite.
• 1983 - Space Shuttle Challenger makes it's maiden flight, STS-6, launching the first TDRS satellite.
• 1984 - A Molniya-M launches the Kosmos-1547 satellite.
• 1986 - A Proton-K launches the Kosmos-1738 satellite.
• 1989 - A Kosmos-3M launches the Kosmos-2016 satellite.
• 1991 - A Proton-K launches three GLONASS satellites.
• 1991 - An Ariane 4 launches the Anik E2 satellite.
• 1997 - A Titan II launches a DMSP satellite.
• 1997 - Space Shuttle Columbia launches on STS-83, a Spacelab microgravity research mission.
• 2000 - A Soyuz-U launches the manned Soyuz TM-30 spacecraft, with the last long-term Mir crew.