Portal:Spaceflight/On This Day/18 March

• 1963 - A Thor-Agena fails to launch a CORONA satellite.
• 1964 - A Kosmos-2I launches the Kosmos 26 satellite.
• 1965 - A Thor-Burner launches a DAPP satellite.
• 1965 - A Voskhod rocket launches the manned Voskhod 2 mission.
• 1965 - Alexey Leonov conducts the first EVA, from the Voskhod 2 spacecraft.
• 1966 - An Atlas-Agena launches an AFP-206 satellite.
• 1969 - An Atlas E/F launches three OV1 satellites.
• 1970 - A Kosmos-2I launches the Kosmos 327 satellite.
• 1971 - A Kosmos-3M launches the Kosmos 400 satellite.
• 1976 - A Soyuz-U launches the Kosmos 809 satellite.
• 1980 - A Vostok-2M rocket at Plesetsk Cosmodrome Site 43 explodes during a fueling operation, killing 48 people.
• 1981 - A Proton-K launches the Raduga satellite.
• 1987 - A Zenit-2 launches the Kosmos 1833 satellite.
• 1995 - An H-II launches the SFU and Himawari 5 satellites.
• 2001 - A Zenit-3SL launches the XM-2 Roll satellite.
• 2011 - MESSENGER entered orbit around Mercury on March 18, 2011, becoming the first spacecraft to do so.
• 2016 - A Soyuz-FG launches the Soyuz TMA-20M carrying Expedition 47 to the International Space Station