Portal:Spaceflight/On This Day/28 January

• 1966 - A Scout A launches a Transit navigation satellite.
• 1975 - A Kosmos-2I launches a DS-P1-Yu radar target satellite.
• 1976 - A Kosmos-3M launches eight Strela communication satellites.
• 1977 - A Delta 2914 launches the NATO 3B communication satellite.
• 1986 - A Soyuz-U launches a Zenit spy satellite.
• 1986 - Space Shuttle Challenger explodes 73 seconds after launch on TDRS-B deployment mission STS-51-L, killing seven astronauts.
• 1989 - A Soyuz-U launches a Yantar-4K1 spy satellite.
• 1994 - A Soyuz-U launches Progress M-21 spacecraft to resupply Mir.
• 2004 - Mars Express completes orbital adjustments, establishing its operational areocentric orbit.
• 2008 - A Proton-M launches the Ekspress AM-33 communication satellite.
• 2010 - A Proton-M launches the Globus-1M No.12L military communication satellite.
• 2011 - A Soyuz-U launches Progress M-09M to resupply the ISS.