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More than 5,000 species are described in the order. The living anurans are typically divided into three suborders: Archaeobatrachia, Mesobatrachia, and Neobatrachia. This classification is based on such morphological features as the number of vertebrae, the structure of the pectoral girdle, and the morphology of tadpoles.
Countries (and successor states) whose citizens have flown in space as of January 2024. The criteria for determining who has achieved human spaceflight vary. The Fédération Aéronautique Internationale (FAI) defines spaceflight as any flight over 100 kilometres (62 mi), while in the United States, professional, military and commercial astronauts who travel above an altitude of 50 miles (80 ...
List of human spaceflights, 1961–1970; List of human spaceflights, 1971–1980; List of human spaceflights, 1981–1990; List of human spaceflights, 1991–2000
Space tourism is human space travel for recreational purposes. [1] There are several different types of space tourism, including orbital, suborbital and lunar space tourism. . Tourists are motivated by the possibility of viewing Earth from space, feeling weightlessness, experiencing extremely high speed and something unusual, and contributing to scie
The study involved 24 astronauts from the U.S., European and Japanese space agencies who traveled aboard the International Space Station for up to 26 weeks. Study documents headaches experienced ...
3D printing in ISS, in-space antenna systems, fiber optics Unknown Operational (2018) [229] Varda Space Industries: building products in space and bringing them back to earth (ex: ZBLAN, 3d printed organs) Unknown Operational (2021) [230] Deep Space Industries: propellant, communications platforms, space solar power satellites: MicroGravity Foundry
The following is a list of space races, meaning competitions or rivalries between states or companies involving the development of space travel. List This ...
For a list of everyone who has flown in space, see List of space travelers by name. More than 600 people have been trained as astronauts. Until recently, astronauts were sponsored and trained exclusively by governments, either by the military or by civilian space agencies.