Portal:Spaceflight/On This Day/26 January

• 1957 - The maiden flight of the Thor missile ends in failure, after the rocket exploded on the launch pad, destroying the launch tower.
• 1962 - An Atlas-Agena launches the Ranger 3 Lunar probe. An upper stage malfunction led to the spacecraft's failure to land on the Moon.
• 1967 - A Delta E launches the ESSA-4 weather satellite.
• 1971 - An Atlas-Centaur launches the Intelsat 4 F-2 communication satellite.
• 1971 - A Kosmos-2I launches a DS-P1-Yu radar target satellite.
• 1973 - A Kosmos-3M launches a Tsyklon navigation satellite.
• 1978 - A Long March 2C launches an FSW spy satellite.
• 1978 - A Delta 2914 launches the IUE astronomy satellite.
• 1983 - A Delta 3910 launches the IRAS and PIX astronomy satellites.
• 1984 - A Soyuz-U2 launches a Zenit-6U spy satellite.
• 1984 - A Kosmos-3M launches a Taifun-1 radar calibration satellite.
• 1984 - A Soyuz-U launches a Zenit-8 spy satellite.
• 1989 - A Proton-K launches the Gorizont 17 communication satellite.
• 1989 - A Kosmos-3M launches a Strela communication satellite.
• 1990 - The crew of Mir perform an EVA to test space suits and examine the space station.
• 1991 - The crew of Mir perform an EVA to install support equipment for solar arrays.
• 1993 - A Molniya-M launches an Oko missile defence satellite.
• 2005 - The crew of the ISS perform an EVA to conduct scientific experiments.