List Of Astronauts By Nationality
The criteria for determining who has achieved human spaceflight vary. The FAI defines spaceflight as any flight over . In the United States, professional, military, and commercial astronauts who travel above an altitude of are awarded astronaut wings. The majority of people who have flown into space have done so by entering Earth orbit. This list includes persons meeting all three criteria, in separate subdivisions. The flags indicate the space traveler's nationality at the time of their flight or flights. In cases of dual citizenship, the space traveler is listed under their primary residence. A secondary list appended to the entry for the Soviet Union shows the birth countries of space travelers not born in Russia. A similar list after the entry for the United States shows the birth countries of space travelers who are or were citizens of the U.S. but were born elsewhere. Flags shown in the secondary lists are those in use at the time of the space travelers' birth. ...
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Space Traveller Nationalities
Space is the boundless three-dimensional extent in which objects and events have relative position and direction. In classical physics, physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime. The concept of space is considered to be of fundamental importance to an understanding of the physical universe. However, disagreement continues between philosophers over whether it is itself an entity, a relationship between entities, or part of a conceptual framework. Debates concerning the nature, essence and the mode of existence of space date back to antiquity; namely, to treatises like the ''Timaeus'' of Plato, or Socrates in his reflections on what the Greeks called ''khôra'' (i.e. "space"), or in the ''Physics'' of Aristotle (Book IV, Delta) in the definition of ''topos'' (i.e. place), or in the later "geometrical conception of place" as "space ...
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