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The Envisat satellite is a large, inactive satellite with a mass of 8,211 kg (18,102 lb) that orbits at 785 km (488 mi), an altitude where the debris environment is the greatest—two catalogued objects can be expected to pass within about 200 m (660 ft) of Envisat every year [40] —and likely to increase. Don Kessler predicted in 2012 that it ...
The accumulation zone is found at the highest altitude of the glacier, where accumulation of material is greater than ablation. On a glacier , the accumulation zone is the area above the firn line, where snowfall accumulates and exceeds the losses from ablation , ( melting , evaporation , and sublimation ).
The Intertropical Convergence Zone is the result of the northeasterly trade winds and southeasterly trade winds converging in an area of high latent heat and low pressure. [3] As the two trade winds converge, the cool, dry air collects moisture from the warm ocean and rises, contributing to cloud formation and precipitation.
A simplified spacecraft system. Dotted orange arrows denote radio links; solid black arrows denote ground network links. (Customer terminals typically rely on only one of the indicated paths for access to space-segment resources.)
Discrete debris accumulation (DDA) is a non-genetic term in mountain glacial geology to aid identification of non-lithified sediments on a valley or mountain slope or floor. It is intended that the debris accumulation is discrete such that it can be mapped, in the field and/or from aerial or satellite imagery.
The name "Pacific Garbage Patch" has led many to believe that this area is a large and continuous patch of easily visible marine debris items such as bottles and other litter – akin to a literal island of trash that should be visible with satellite or aerial photographs. This is not the case. —
The satellite may also have insufficient fuel to complete the maneuver properly, reducing its effectiveness. Collision avoidance maneuvers require significant planning and execution time, which can be an issue if the risk isn't predicted sufficiently in advance.
The South Atlantic Anomaly (SAA) is an area where Earth's inner Van Allen radiation belt comes closest to Earth's surface, dipping down to an altitude of 200 kilometres (120 mi). This leads to an increased flux of energetic particles in this region and exposes orbiting satellites (including the ISS ) to higher-than-usual levels of ionizing ...