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Get Up to 93% Off In Our Summer Kick Off Sale | Canvas Prints

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Get Up to 93% Off In Our Summer Kick Off Sale | Canvas Prints



From Wikipedia, the free encyclopedia
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File:NASA Earth-observing Fleet June 2012.ogv
NASA's Earth-observing fleet as of June 2019

A full-size model of the Earth observation satellite ERS 2
In the context of spaceflight, a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such as Earth's Moon.

On 4 October 1957, the Soviet Union launched the world's first artificial satellite, Sputnik 1. Since then, about 8,900 satellites from more than 40 countries have been launched. According to a 2018 estimate, about 5,000 remained in orbit. Of those, about 1,900 were operational, while the rest had exceeded their useful lives and become space debris. Approximately 63% of operational satellites are in low Earth orbit, 6% are in medium-Earth orbit (at 20,000 km), 29% are in geostationary orbit (at 36,000 km) and the remaining 2% are in various elliptical orbits. In terms of countries with the most satellites, the United States has the most with 1,897 satellites, China is second with 412, and Russia third with 176. A few large space stations, including the International Space Station, have been launched in parts and assembled in orbit. Over a dozen space probes have been placed into orbit around other bodies and become artificial satellites of the Moon, Mercury, Venus, Mars, Jupiter, Sat
 urn, a few asteroids, a comet and the Sun.

Satellites are used for many purposes. Among several other applications, they can be used to make star maps and maps of planetary surfaces, and also take pictures of planets they are launched into. Common types include military and civilian Earth observation satellites, communications satellites, navigation satellites, weather satellites, and space telescopes. Space stations and human spacecraft in orbit are also satellites.

Satellites can operate by themselves or as part of a larger system, a satellite formation or satellite constellation.

Satellite orbits vary greatly, depending on the purpose of the satellite, and are classified in a number of ways. Well-known (overlapping) classes include low Earth orbit, polar orbit, and geostationary orbit.

A launch vehicle is a rocket that places a satellite into orbit. Usually, it lifts off from a launch pad on land. Some are launched at sea from a submarine or a mobile maritime platform, or aboard a plane (see air launch to orbit).

Satellites are usually semi-independent computer-controlled systems. Satellite subsystems attend many tasks, such as power generation, thermal control, telemetry, attitude control, scientific instrumentation, communic

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Get Up to 93% Off In Our Summer Kick Off Sale | Canvas Prints



he 1993 Atlantic hurricane season was a below average Atlantic hurricane season that produced ten tropical cyclones, eight tropical storms, four hurricanes, and one major hurricane. It officially started on June 1 and ended on November 30, dates which conventionally delimit the period during which most tropical cyclones form in the Atlantic Ocean. The first tropical cyclone, Tropical Depression One, developed on May 31, while the final storm, Tropical Depression Ten, dissipated on September 30, well before the average dissipation date of a season's last tropical cyclone; this represented the earliest end to the hurricane season in ten years. The most intense hurricane, Emily, was a Category 3 on the Saffir–Simpson Hurricane Scale that paralleled close to the North Carolina coastline causing minor damage and a few deaths before moving out to sea.

The most significant named storm of the season was Hurricane Gert, a tropical cyclone that devastated several countries in Central America and Mexico. Throughout the impact areas, damage totaled to $170 million (1993 USD)[nb 1] and 102 fatalities were reported. The remnants of Gert reached the Pacific Ocean and was classified as Tropical Depression Fourteen-E. Another significant system was Tropical Storm Bret, which resulted in 184 deaths and $25 million in losses as it tracked generally westward across Trinidad, Venezuela, Colombia, and Nicaragua. In the Pacific Ocean, the remnants of Bret were attributed to the development of Hurricane Greg. Three other tropical cyclones brought minor to moderate effects on land; they were Tropical Depression One and Tropical Storms Arlene and Cindy. The storms of the 1993 Atlantic hurricane season collectively caused 382 fatalities and $322.3 million in loss

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