near-earth satellite

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• Near-Earth asteroid — Near Earth asteroids (NEAs) are asteroids whose orbits are close to Earth s orbit. All near Earth asteroids spend part of their orbits between 0.983 and 1.3 astronomical units away from the Sun. Some near Earth asteroids orbits intersect Earth s… …   Wikipedia

• Near-Earth object — Asteroid 4179 Toutatis is a potentially hazardous object that has passed within 2.3 lunar distances …   Wikipedia

• Near Earth Object Surveillance Satellite — The Near Earth Object Surveillance Satellite (NEOSSat)[1] is a Canadian microsatellite using a 15 cm aperture f/5.88 Maksutov telescope similar to that on the MOST spacecraft, 3 axis stabilized with pointing stability of 2 arcseconds in a 100… …   Wikipedia

• Near Earth Network — The Near Earth Network (NEN, formerly GN or Ground Network) provides orbital communications support for Near Earth orbiting customer platforms via various NASA ground stations. NASA s NEN consists of ground stations in: Merritt Island Launch… …   Wikipedia

• Satellite laser ranging — In satellite laser ranging (SLR) a global network of observation stations measure the round trip time of flight of ultrashort pulses of light to satellites equipped with retroreflectors. This provides instantaneous range measurements of… …   Wikipedia

• Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

• earth — /errth/, n. 1. (often cap.) the planet third in order from the sun, having an equatorial diameter of 7926 mi. (12,755 km) and a polar diameter of 7900 mi. (12,714 km), a mean distance from the sun of 92.9 million mi. (149.6 million km), and a… …   Universalium

• Satellite — This article is about artificial satellites. For natural satellites, also known as moons, see Natural satellite. For other uses, see Satellite (disambiguation). An animation depicting the orbits of GPS satellites in medium Earth orbit …   Wikipedia

• NEAR Shoemaker — This article is about the robotic space probe named NEAR Shoemaker. For the type of asteroid, see Near Earth asteroid. For the public alarm system tested by the U.S. government in the 1950s and 1960s, see National Emergency Alarm Repeater. Artist …   Wikipedia

• Earth exploration — Introduction   the investigation of the surface of the Earth and of its interior.  By the beginning of the 20th century most of the Earth s surface had been explored, at least superficially, except for the Arctic and Antarctic regions. Today the… …   Universalium

• Satellite Internet access — Satellite Internet services are used in locations where terrestrial Internet access is not available and in locations which move frequently. Internet access via satellite is available worldwide, including vessels at sea and mobile land… …   Wikipedia