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This is a timeline of space exploration which includes notable achievements, first accomplishments and milestones in humanity's exploration of outer space. This timeline generally does not distinguish achievements by a specific country or private company, as it considers humanity as a whole. See otherwise the timeline of private spaceflight or ...
Space programs of the United States date to the start of the Space Age in the late 1940s and early 1950s. Programs involve both crewed systems and uncrewed satellites, probes and platforms to meet diverse program objectives. From a definition perspective, the criteria for what constitutes spaceflight vary.
For the purpose of these lists, a spaceflight is defined as any flight that crosses the Kármán line, the FAI-recognized edge of space, which is 100 kilometres (62 miles) above mean sea level (AMSL). The timeline contains all flights which have crossed the edge of space, were intended to do so but failed, or are planned in the near future.
Program Start date First crewed flight End date No. of crewed missions launched Notes Mercury program: 1958 1961: 1963: 6: First U.S. crewed program Gemini program: 1961 1965: 1966: 10: Program used to practice space rendezvous and EVAs: Apollo program: 1960 1968: 1972: 11: Landed first humans on the Moon Skylab: 1964 1973: 1974: 3: First ...
This is a timeline of Solar System exploration ordering events in the exploration of the Solar System by date of spacecraft launch. It includes: All spacecraft that have left Earth orbit for the purposes of Solar System exploration (or were launched with that intention but failed), including lunar probes. A small number of pioneering or notable ...
This timeline of artificial satellites and space probes includes uncrewed spacecraft including technology demonstrators, observatories, lunar probes, and interplanetary probes. First satellites from each country are included. Not included are most Earth science satellites, commercial satellites or crewed missions.
Timeline of the Space Race. This is a timeline of achievements in Soviet and United States spaceflight, spanning the Cold War era of nationalistic competition known as the Space Race. This list is limited to first achievements by the USSR and USA which were important during the Space Race in terms of public perception and/or technical innovation.
Space policy process. United States space policy is drafted by the Executive branch at the direction of the President of the United States, and submitted for approval and establishment of funding to the legislative process of the United States Congress. Space advocacy organizations may provide advice to the government and lobby for space goals.