|Space traveller|| Soviet Union |
|Maiden flights|| Atlas LV-3A Agena-B |
Saturn I (suborbital test)
|Retirements|| Atlas LV-3A Agena-A |
|19 May||Venera 1||First flyby of Venus||Spacecraft was already non-functional as communication had been lost en route, closest approach: 100,000 kilometres (62,000 mi)|
|Date/Time (UTC)||Source object||Event type||Pieces tracked||Remarks|
|29 June||Thor-Able upper stage of Transit 4A navigation satellite||Rocket explosion||294||First explosion of a rocket stage in orbit creating hundreds of debris pieces|
|Orbital launch attempts by country in 1961|
|Atlas LV-3A Agena-A||United States||1||1||0||0||Retired|
|Atlas LV-3A Agena-B||United States||7||2||4||1||Maiden flight|
|Atlas LV-3B||United States||3||2||1||0||First orbital launch|
|RM-90 Blue Scout II||United States||1||0||1||0||First orbital launch|
|Juno II||United States||3||1||2||0||Retired|
|Kosmos-2I 63S1||Soviet Union||2||0||2||0||Maiden flight|
|Molniya 8K78||Soviet Union||2||1||1||0|
|Scout X-1||United States||3||1||2||0|
|Thor DM-21 Ablestar||United States||3||2||0||1|
|Thor DM-21 Agena-B||United States||17||11||6||0|
|Thor DM-19 Delta||United States||3||3||0||0|
|Vostok-K 8K72K||Soviet Union||5||4||1||0|
|Orbital regime||Launches||Achieved||Not Achieved||Accidentally Achieved||Remarks|
|High Earth||6||2||4||0||Including Highly elliptical orbits|
Explorer 1 was the first American satellite to reach orbit on 31 January 1958.
1973 saw the launch of the first American Space station known as Skylab on a Saturn rocket.
This article outlines notable events occurring in 1995 in spaceflight, including major launches and EVAs.
The following is an outline of 1981 in spaceflight.
The following is an outline of 1983 in spaceflight.
The following is an outline of 1985 in spaceflight.
This article outlines notable events occurring in 1994 in spaceflight, including major launches and EVAs.
This is a list of spaceflight related events which occurred in 1956.
This is a list of spaceflight related events which occurred in 1955.
The following is an outline of 1992 in spaceflight.
The following is an outline of 1989 in spaceflight.
The following is an outline of 1976 in spaceflight.
The following is an outline of 1979 in spaceflight.
The following is an outline of 1980 in spaceflight.
The following is an outline of 1987 in spaceflight.
The following is an outline of 1988 in spaceflight.
This is a list of spaceflights launched between January and June 1961. For launches between July and December, see 1961 in spaceflight (July–December). For an overview of the whole year, see 1961 in spaceflight.
Two hours after separating from the U.S. Transit 4-A satellite, its Able Star upper stage becomes the first known artificial object to break up unintentionally in space. The cause of the explosion is unknown. The event produces at least 294 trackable pieces, more than tripling the number of known satellites of Earth.