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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.
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.
Greenland ice sheet as seen from space. An ice sheet is a body of ice which covers a land area of continental size - meaning that it exceeds 50,000 km 2. [4] The currently existing two ice sheets in Greenland and Antarctica have a much greater area than this minimum definition, measuring at 1.7 million km 2 and 14 million km 2, respectively.
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.
Over the course of the 19-year survey (1992 – 2011), the average rates of mass balance of the Antarctic and Greenland ice sheets were estimated to be -71 ± 53 and -152 ± 49 Gt yr −1, respectively, and the total ice loss equated to a global rise in sea level of 11.1 ± 3.8 mm. [2] Examining the ice sheet regions individually showed that ...
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 ...
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 ...
Annual ice losses from the Greenland ice sheet accelerated in the 2000s, reaching ~187 Gt/yr in 2000–2010, and an average mass loss during 2010–2018 of 286 Gt per year. Half of the ice sheet's observed net loss (3,902 gigatons (Gt) of ice between 1992 and 2018, or approximately 0.13% of its total mass [ 53 ] ) happened during those 8 years.