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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.
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
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 ...
propellant, space infrastructure, propellant depot: Unknown Defunct (2020) [228] Made In Space: 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 ...
The following is a list of space races, meaning competitions or rivalries between states or companies involving the development of space travel. List This ...
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 ...
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.
First billionaire in space, orbital space; first space tourist to the International Space Station [3] [1] [4] Mark Shuttleworth: Space Adventures ISS EP-3 (Soyuz TM-34/TM-33) 25 April 2002: 2 May 2002: First insured space tourist; First South African, first person from Africa in space, orbital space; second space tourist to the International ...