The answer varies depending on the spacecraft. As space exploration has evolved there can be up to 8 passengers on some craft although the first spacecraft only allowed for a singular pilot.
On April 12, 1961, Yuri Gagarin, a Soviet cosmonaut, became the first human to travel to space aboard the Vostok capsule. Gagarin completed just over one full orbit of Earth during his flight. The Vostok capsule could accommodate only one astronaut in its primary spherical cabin, which was situated on top of a band of life-support gas tanks and a pyramidal instrument module that was detached before the cabin's reentry into Earth's atmosphere. During the flight, a window located near the astronaut's feet enabled them to observe Earth.
The capsule lacked landing gear, and Gagarin and his successors were ejected from the capsule during the reentry process. The Soviet Union concealed this information to maintain the authenticity of the mission as a spaceflight.
NASA states that Vostok means "East," and Gagarin's capsule was known as Swallow. In total, six Vostok capsules carried cosmonauts into orbit from 1961 to 1963. The final Vostok flight transported Valentina Tereshkova, who became the first woman in space.
The Gemini program was one of the first human spaceflight initiatives undertaken by NASA, aimed at preparing for the Apollo moon landings.
The Project Gemini was NASA's second human spaceflight program that took place between the Mercury and Apollo projects, with sixteen pilots serving as Gemini astronauts. The Gemini spacecraft carried a senior command pilot and a junior pilot, allowing for two astronauts to travel together. The program comprised ten crewed missions in total.
What was the maximum capacity of the Mercury capsule in terms of astronauts? It had a compact design that accommodated only one astronaut who remained seated throughout the flight. Project Mercury employed two types of rockets, with the initial two out of six astronaut-carrying missions using a Redstone rocket.
The initial human space flight program of the United States, Mercury, introduced the nation to its first group of astronauts. In total, there were six flights that carried six astronauts. The combined duration of these missions amounted to 53 hours, 55 minutes, and 27 seconds.
In the early 1960s, during the Eisenhower administration, the Apollo program was created as a sequel to Project Mercury. While Project Mercury was limited to one astronaut on a mission in Earth's orbit, the Apollo program was designed to carry three astronauts.
With a design that featured an orbiter alongside two reusable solid rocket boosters and a disposable external fuel tank, the Space Shuttle was capable of transporting up to eight astronauts and a payload of up to 50,000 lb (23,000 kg) into low Earth orbit (LEO).
The Soyuz spacecraft has a weight of 7 tonnes and its dimensions are 7.2 m in length and 2.7 m in diameter. The solar panels, which are closed during launch, increase the spacecraft's width to 10.6 m when opened. The Soyuz is capable of carrying up to three astronauts.
The Soyuz is composed of three modules: the service module, the orbital module, and the reentry module. The orbital module, located at the tip of the spacecraft, carries the equipment required for docking with the International Space Station. The service module, located at the lower part, carries the telecommunications and altitude control equipment, as well as the coupling for the solar panels. The descent module, located in the middle, is where the astronauts travel and it is the only section that reenters the atmosphere. The orbital module breaks up during reentry.
There have been 848 total shuttle fliers (852 including STS-135 crew). People representing 16 different countries have flown on shuttle flights. 306 men and 49 women have flown aboard shuttles.
Capable of carrying up to 7 passengers to and from Earth orbit and beyond, the Dragon spacecraft is the only currently operational spacecraft that can return sizable amounts of cargo to Earth. Furthermore, it made history as the first private spacecraft to transport humans to the International Space Station.
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