Frequently Asked Questions
The most-asked questions about astronauts and space pioneers.
What does this encyclopedia cover?
It is a community-driven reference devoted to the people who have flown to space and the trailblazers who made spaceflight possible, stretching from early rocket experiments to today's commercial crew missions. You will find biographies, mission timelines, and behind-the-scenes stories that official press releases tend to skip.
Who are the most iconic figures in space history?
The names that surface most often are Yuri Gagarin (first human in orbit), Neil Armstrong (first on the Moon), Valentina Tereshkova (first woman in space), and Mae Jemison (first Black woman in space). In the modern era, figures like Chris Hadfield, Peggy Whitson, and the crews of the 2020s commercial missions have become widely recognized.
Where should a newcomer start reading?
The 'First Steps' section walks through 1957–1972 chronologically, giving you the foundational context before you dive into individual biographies. From there, the thematic collection pages let you explore by topic—women in space, record-setters, or programs like Apollo and the ISS.
How many humans have flown to space?
As of 2025, roughly 750 people have crossed the Kármán line, though only a small fraction have gone beyond low Earth orbit to the Moon or farther. The count has climbed quickly since 2020 thanks to commercial flights operated by SpaceX, Blue Origin, and Virgin Galactic.
What counts as a 'space pioneer' versus a regular astronaut?
The encyclopedia reserves 'pioneer' for individuals who broke a specific barrier—first woman, first civilian, first from a given nation, or first to perform a particular type of mission. A career astronaut who flies multiple ISS rotations is catalogued under their mission entries but may not carry the pioneer tag.
What are some of the most dramatic moments in spaceflight history?
The 1970 Soyuz 11 reentry failure, the 1986 Challenger disaster, and the 2003 Columbia breakup remain the most-visited pages for their emotional weight and engineering lessons. On the triumph side, the 1969 Apollo 11 landing and the 2021 SpaceX Crew-1 splashdown are frequently highlighted.
What is the difference between astronaut, cosmonaut, and taikonaut?
The terms simply reflect the nationality of the program: NASA says 'astronaut,' Roscosmos says 'cosmonaut,' and China's CNSA says 'taikonaut.' Functionally all three refer to a trained human launched into space, and this encyclopedia treats them as equivalent categories.
How does the encyclopedia handle disputed or classified information?
Every entry links to its primary sources—NASA archives, Roscosmos releases, or peer-reviewed papers—and flags anything that is inferred rather than confirmed. Where governments have redacted details, such as certain Cold War missions, the page states what is publicly known and what remains uncertain.
Are private-sector spaceflight companies covered?
Yes. Crews from SpaceX, Blue Origin, Axiom Space, and other commercial operators have dedicated pages, and the 'Commercial Era' section tracks the shift from government-only flights to multi-provider access that began in 2020.
How often is the content updated?
The community typically adds a new mission page within days of a splashdown and revises biographies as declassified documents or memoirs surface. Larger structural changes, such as new thematic collections or corrected timelines, are rolled out on a roughly quarterly cycle.