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This includes national space programs, industry and commercial space programs which train and/or hire their own professional astronauts. The flags indicate the astronaut's primary citizenship during his or her time as an astronaut. The symbol identifies female astronauts. The symbol indicates astronauts who have left low Earth orbit.
The "ice giant" (sometimes known as "water giant") planets Uranus and Neptune are thought to have a supercritical water ocean beneath their clouds, which accounts for about two-thirds of their total mass, [30] [31] most likely surrounding small rocky cores, although a 2006 study by Wiktorowicz and Ingersall ruled out the possibility of such a ...
Sonar mapping of the Challenger Deep by the DSSV Pressure Drop employing a Kongsberg SIMRAD EM124 multibeam echosounder system (26 April–4 May 2019). Challenger Deep (CD) is the deepest known point in the Earth's seabed hydrosphere, a slot-shaped valley in the floor of Mariana Trench, with depths exceeding 10,900 meters. [1]
The first space rendezvous was accomplished by Gemini 6A and Gemini 7 in 1965.. Records and firsts in spaceflight are broadly divided into crewed and uncrewed categories. Records involving animal spaceflight have also been noted in earlier experimental flights, typically to establish the feasibility of sending humans to outer space.
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 ...
Amidst the bell bottoms, funky prints, and free-spirited natures of the 1970s, a crop of baby names saw their height of fame. Today, these girl and boy names are seen as “classic ...
Planetary habitability in the Solar System is the study that searches the possible existence of past or present extraterrestrial life in those celestial bodies. As exoplanets are too far away and can only be studied by indirect means, the celestial bodies in the Solar System allow for a much more detailed study: direct telescope observation, space probes, rovers and even human spaceflight.
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