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GRACE data have provided a record of mass loss within the ice sheets of Greenland and Antarctica. Greenland has been found to lose 280 ± 58 Gt of ice per year between 2003 and 2013, while Antarctica has lost 67 ± 44 Gt per year in the same period. [21] These equate to a total of 0.9 mm/yr of sea level rise.
Greenland has a 1.2-kilometer-long (0.75 mi) border with Canada on Hans Island. [1] A sparse population is confined to small settlements along certain sectors of the coast. Greenland possesses the world's second-largest ice sheet. Greenland sits atop the Greenland plate, a subplate of the North American Plate.
The ICESat mission was designed to provide elevation data needed to determine ice sheet mass balance as well as cloud property information, especially for stratospheric clouds common over polar areas. It provides topography and vegetation data around the globe, in addition to the polar-specific coverage over the Greenland and Antarctic ice sheets.
The Rockwell X-30 National Aero-Space Plane (NASP), begun in the 1980s, was an attempt to build a scramjet vehicle capable of operating like an aircraft and achieving orbit like the shuttle. Introduced to the public in 1986, the concept was intended to reach Mach 25, enabling flights between Dulles Airport to Tokyo in two hours, while also ...
Robotic orbiter operated by the United States Armed Forces. BOR-4: USSR: ... Uncrewed suborbital space plane. Horizontal takeoff and landing. ... Space Shuttle: USA ...
The 1951 Defense of Greenland Agreement provides a legal and historical basis for the United States to assert greater control over Greenland, which is increasingly critical for national security ...
1989 aerial view. Pituffik Space Base (/ b iː d uː ˈ f iː k / bee-doo-FEEK; [2] Greenlandic:; IATA: THU, ICAO: BGTL), formerly and perhaps better known as Thule Air Base (/ t uː l iː / or / t uː l eɪ /), is a United States Space Force base located on the northwest coast of Greenland.
It is an approximately 120-percent-scale derivative of the Boeing X-40, [6] [22] measuring over 29 feet (8.8 m) in length, and features two angled tail fins. [26] [41] The X-37 launches atop an Atlas V 501 [26] [19] or a SpaceX Falcon 9 [42] or Falcon Heavy [43] rocket. The spaceplane is designed to operate in a speed range of up to Mach 25 on ...