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         Satellites:     more books (100)
  1. Satellite Communications, Fourth Edition (Professional Engineering) by Dennis Roddy, 2006-01-20
  2. Introduction to Satellite Communication (Artech House Space Applications) by Bruce R. Elbert, 2008-06-30
  3. Satellite Communications Systems: Systems, Techniques and Technology by Gerard Maral, Michel Bousquet, 2010-02-16
  4. GPS Satellite Surveying by Alfred Leick, 2003-12-18
  5. Satellite Sisters' Uncommon Senses by Julie Dolan, Liz Dolan, et all 2002-11-05
  6. Spy Satellites and Other Intelligence Technologies That Changed History by Thomas Graham Jr., Keith Hansen, 2007-05-15
  7. The World of Satellite Television by Mark Long, 1998-10
  8. Satellite Remote Sensing for Archaeology by Sarah H. Parcak, 2009-05-12
  9. Space Satellite Handbook, Third Edition by Anthony R. Curtis, 1994-01-15
  10. Satellite Communications by Timothy Pratt, Charles W. Bostian, et all 2002-10-25
  11. Theory of Satellite Geodesy: Applications of Satellites to Geodesy by William M. Kaula, 2000-11-27
  12. Map: Satellite by DK Publishing, 2007-03-19
  13. Principles of Communications Satellites by Gary D. Gordon, Walter L. Morgan, 1993-07-22
  14. Satellite Television: Analogue and Digital Reception Techniques by Herve Benoit, 1999-07-16

1. Satellite, Satellites, Satellite System At SPACE.com
Space.com explains satellite phenomena, satellites, satellite systems, satellite images and satellite dishes.
http://www.space.com/satellite/
Satellites
A satellite is defined as any object that orbits any other object. Satellites can be celestial, such as a moon orbiting a planet in the solar system , or a planet in the solar system orbiting the sun . Satellites can also be man-made. Man-made satellites are typically launched into outer space from earth to collect data, photos and other information about Earth and all the many things that exist around it. From studying outer space and Earth’s atmosphere to tracking weather patterns and acquiring intelligence, satellites illuminate us with vital information and visual imagery that can not be captured in any other manner. Stay up to date with the latest satellite system information and news. Whether you’re interested in NASA and the Mars Renaissance Orbiter, which was the most recent satellite to visit the red planet, or the on-going global race to further research and explore the moon, our diverse satellite images, articles and other news features will expose you to distant places, planets and infinite possibilities for learning more about this expansive galaxy we call home.

2. Howstuffworks "How Satellites Work"
Not so long ago, satellites were exotic, topsecret devices. They were used primarily in a military capacity, for activities such as navigation and
http://science.howstuffworks.com/satellite.htm
HowStuffWorks.com RSS Make HowStuffWorks your homepage Get Newsletter Search HowStuffWorks and the web:
Science
Space Space Exploration Space exploration is a broad topic covering many facets of deep-space and planetary science. Learn about space probes, Mars Rovers, SETI and other out-of-this-world subjects. Related Categories:
REFERENCE LINKS satellite tv Dish Network Dish Network PRINT ... EMAIL How Satellites Work by Gary Brown
Inside This Article Introduction to How Satellites Work What is a Satellite? How is a Satellite Launched into an Orbit? Orbital Velocity and Altitude What is a Satellite Launch Window? ... articles Not so long ago, satellites were exotic, top-secret devices. They were used primarily in a military capacity, for activities such as navigation and espionage. Now they are an essential part of our daily lives. We see and recognize their use in weather reports, television transmission by DIRECTV and the DISH Network, and everyday telephone calls. In many other instances, satellites play a background role that escapes our notice:
  • Some newspapers and magazines are more timely because they transmit their text and images to multiple printing sites via satellite to speed local distribution.

3. LIVE REAL TIME SATELLITE AND SPACE SHUTTLE TRACKING
Real time satellite tracking web application. Over 8000 satellites real time tracked. Other thousands of objects in our database.
http://www.n2yo.com/
REAL TIME SATELLITE TRACKING powered by AJAX
Enter your search terms Submit search form Web www.n2yo.com MOST POPULAR ISS (ZARYA) SIRIUS 3 XM-1 XM-3 ... XM-2 LATEST LAUNCHES TECSAR THURAYA 3 SL-25 PLAT SL-12 PLAT ... PROGRESS-M 62 POPULAR CATEGORIES GEOSTATIONARY BRIGHTEST WEATHER NOAA ... GPS OPERATIONAL LIVE IN YOUR SKY GPS SATELLITES IRIDIUM SATELLITES GLOBALSTAR SATELLITES SIRIUS/XM SATELLITES ... WHAT'S UP? OTHER SATELLITE FEATURES ALL CATEGORIES SEARCH DATABASE BROWSE BY LAUNCH SATELLITE NEWS ... SUPPORT N2YO.COM
SATELLITE AND SPACE SHUTTLE NEWS
CHINA TO LAUNCH NEW WEATHER SATELLITE IN MAY - China will launch a new generation of a polar orbit meteorological satellite, Fengyun-3, in May to improve the precision of weather forecasting, China News Service reported. In Beijing on Tuesday, officials at a work conference designed to coordinate the satellite's launch work decided that Fengyun-3 would use a Long March 4-C rocket as its carrier. Preparations for the completion of satellite in early March and its launch in May at Taiyuan Satellite Launch Center, in northern China's Shanxi Province, were also approved at the conference. More
Source: China Internet Information Center
AMATEUR RADIO SATELLITE AO-16 RECONFIGURED - AO-16 has been reconfigured to provide Radio Amateurs with a novel FM to SSB satellite transponder.

4. How Satellites Work: Teacher Resource
In little more than a generation, the launching of a satellite has gone from stopping the nation s business to guaranteeing that it runs like clockwork.
http://www.gma.org/surfing/sats.html
How Satellites Work
What is a Satellite? Geostationary (GOES) Satellites What are the components
of a human-made satellite?
... OSCAR Satellites These links take you to subsections of this page. You can scroll down the entire page, or jump to a topic of interest. In little more than a generation, the launching of a satellite has gone from stopping the nation's business to guaranteeing that it runs like clockwork. Today, satellites, like clocks, telephones, and computers, are commonplace tools of technology. They help us navigate, communicate, monitor the environment, and forecast weather. Appropriately, the word satellite means an "attendant." In 1957, the launching of the Russian satellite Sputnik changed the course of our nation. The United States immediately launched massive efforts to compete in a breakneck Race to the Moon. In the space of a decade, our nation of armchair explorers sat glued to their television sets while Alan Shepard went up and back in a Mercury capsule in 1961, as John Glenn circled the globe 3 times in 1962, and as Neil Armstrong set foot on the moon in 1969. That sense of discovery has muted over time as we became accustomed to the miracles of space travel. The launching of a Space Shuttle mission may not even come up in a class discussion of current events, yet satellites bring those same students the ability to watch the Olympics, the weather, and news of other events from around the world that are considered "newsworthy."

5. Visual Satellite Observer S Home Page
Visual Satellite Observer s Home Page provides information for observing earth satellites.
http://www.satobs.org/

6. Satellites And Satellite Trackers
By understanding the basic physical laws of the universe, we can design satellite orbits to serve many special purposes. Learn about the Orbital Mechanics
http://liftoff.msfc.nasa.gov/academy/rocket_sci/satellites/
satellite
1. A natural body that revolves around a planet; a moon.
2. An object designed to be launched into orbit around the earth, another planet, the sun, etc. excerpt from the Random House Webster's College Dictionary How Does It Work? By understanding the basic physical laws of the universe, we can design satellite orbits to serve many special purposes. Learn about the Orbital Mechanics of Satellites in our Space Academy under rocket science. Liftoff Home Did you know there are over eight thousand artificial objects orbiting Earth? Over 2,500 are satellites, operative and inoperative. The remaining objects are orbital debris: parts such as nosecone shrouds, lens, hatch covers, rocket bodies, payloads that have disintegrated or exploded, and even objects that "escape" from manned spacecraft during operations. Spacecraft Tracking
Find out where the Hubble Space Telescope, the Mir space station, and the Space Shuttle (during missions) are right now, and watch their progress across the surface of the earth using our popular J-Track Java spacecraft tracker. (And don't forget to try the new 3D version!) If you don't have Java, try the image pages below.

7. NOAA - National Oceanic And Atmospheric Administration - Satellites
Provides extensive resources on weather, oceanography and related satellite services by the government in USA.
http://www.noaa.gov/satellites.html
Search Criteria
Satellites
When you watch the news and see pictures of weather from around the United States or the world, you are seeing data from NOAA’s environmental satellites. NOAA’s environmental satellites provide data from space to monitor the Earth to analyze the coastal waters , relay life-saving emergency beacons , and track tropical storms and hurricanes NOAA operates two types of satellite systems for the United States - geostationary satellites and polar-orbiting satellites.  Geostationary satellites constantly monitor the Western Hemisphere from around 22,240 miles above the Earth, and polar-orbiting satellites circle the Earth and provide global information from 540 miles above the Earth. Satellites enable us to provide consistent, long-term observations, 24 hours a day, 7 days a week.  They

8. NASA - Science@NASA J-Track 3D
Be sure to try the Satellite pulldown menu to choose which satellite you If you don t have Java, here are some of the most popular satellites for
http://science.nasa.gov/Realtime/jtrack/3d/JTrack3D.html
The Science@NASA site works best with JavaScript enabled in your browser. For instructions, click here
+ NASA Home

+ Search NASA Web

+ Contact NASA
...
+Home
Shortcuts Shift+Click Zoom In Ctrl+Click Zoom Out Click on satellite show trace Click in list show trace Drag rotate in 3d We hope you enjoy J-Track 3-D. It should appear in its own window and begin loading a database of over 900 satellites. What you will see (assuming your system supports this JAVA applet) is a plot in 3-dimensions showing the position of these satellites. Be sure to try the "Satellite" pull-down menu to choose which satellite you wish to view. If you don't have Java, here are some of the most popular satellites for tracking that you can view (no Java required!):

9. Amateur Satellites : Operating Modes: Satellites
Amateur Satellite FAQ Beginner guide to amateur satellite, with tech info about accessories, antennas, and frequencies.
http://www.dxzone.com/catalog/Operating_Modes/Satellites/
You are here: Home Operating Modes : Satellites Search in "Satellites"
Satellites
Satellites related links
(Featuring 60 links) Categories
  • AO-51
  • Clubs Additional Categories
  • Operating Modes/Amateur Radio Astronomy
  • Software/APRS
  • Operating Modes/EME
  • Technical Reference/Homebrew ...
  • Software/Weather and FAX Site listings Home Operating Modes : Satellites Add a link Most Popular
  • 10. Satellites: Surfing The Net With Kids
    The best satellite sites on the Web for families (from the United Feature Syndicate) rated and reviewed.
    http://www.surfnetkids.com/satellite.htm
    ...Click for Menu... ~~ Home ~~ Light a Fire Quotations How to Add Games Email Book Clubs Book Store Calendar Blog Free Kids Coloring Free Kids Trivia Free Web Content Games Kids Jokes Newsletters Parents Postcards Printables Screensavers Suggest a Site Tell a Friend Top Ten Pages Topic Directory ~~ Search this Site Arts, Crafts, Music Computers, Internet Hobbies, Sports Geography Holidays, History Language Arts Math Parents, Teachers Pre-K and K Science, Animals Link to Us From my Mailbox My Bio Ad Rates Write Me Visit My Office

    11. Satellites
    The system comprises several satellites that provide worldwide, secure, twoway X-band communications and continental United States Air Force Strategic
    http://www.aero.org/programs/satellites.html
    @import url(/main.css); The Aerospace Corporation Homepage
    • About Us
      Satellites/Current Programs
      Defense Satellite Communications System (DSCS) Defense Meteorological Satellite Program (DMSP) Defense Support Program (DSP) Aerospace provides critical support to DSP, which comprises 23 missile launch-warning satellites that will be replaced by the Space Based Infrared System High program, the development of which we also support. Aerospace has devised and demonstrated new ways to merge DSP data with other intelligence information for real-time tactical force updates and for detecting forest fires and other natural disasters and phenomena. Global Broadcast Service (GBS) Developed in the mid-1990s, GBS can rapidly deliver large volumes of information to military users. Its need became apparent during Operation Desert Storm, when bandwidth constraints limited the amount of information that could be transmitted to the frontline. Because of GBS, critical video, maps, charts, weather patterns and digital data can be transmitted in seconds to mobile users equipped with small tactical terminals. Global Positioning System (GPS) Milstar The first Milstar I satellite was launched in 1994, and Aerospace supported the integration and test of the Milstar I and II series of satellites. The Milstar program provides National Command Authorities and Department of Defense users with worldwide survivable extremely high-frequency (EHF) communications. The system supports strategic and tactical missions using fixed-site terminals and small mobile terminals. Global connectivity is provided through satellite EHF crosslinks, which will be replaced by the Advanced Extremely High Frequency program as our military's core communications system.

    12. Universe Today » Satellites
    On Saturday night, the largest US rocket blasted off, carrying a 2.3 tonne Defense Support Program satellite into orbit. This was the second time a Delta
    http://www.universetoday.com/category/satellites/
    Satellites
    November 13th, 2007
    Gigantic Delta 4-Heavy Blasts Off
    Satellites October 10th, 2007
    The Tiger Stripes and Geysers are Linked on Enceladus
    Satellites Saturn October 8th, 2007
    Ariane 5 Lofts Two Satellites
    An Ariane 5 rocket blasted off its launch pad on Friday, October 5, carrying two telecommunications satellites into orbit. The rocket lifted off at 22:02 UTC, and the satellites were put into their geostationary transfer orbits 30 minutes later. The two satellites were the Intelsat 11, which will provide broadcast and data communications services to Latin America, and the Optus D2, which will serve Australia and New Zealand. The payload mass for the two satellites was 4832 kg. This was the fourth launch of the year for the Ariane rocket. Original Source: ESA News Release Satellites September 18th, 2007
    Google Maps
    and Google Earth
    Earth Observation
    Satellites August 15th, 2007
    Ariane 5 Lofts Two Satellites
    Satellites Space Flight July 11th, 2007
    The Whole Sky Seen in Infrared
    Astronomy Satellites June 26th, 2007
    Gamma Ray Observatory Will Launch in December
    Gamma Ray Bursts Satellites June 25th, 2007

    13. Department Of Commerce Home Page - Satellites
    As an integral part of worldwide search and rescue, NOAA operates the Search Rescue Satellite Aided Tracking (SARSAT) System to locate those in distress
    http://www.commerce.gov/satellites.html
    HOME Presidential Appointments Newsroom Career Jobs ...
    Print

    IN THE SPOTLIGHT
    SARSAT
    Around the world...around the clock...NOAA proudly stands watch. As an integral part of worldwide search and rescue, NOAA operates the to locate those in distress almost anywhere in the world at anytime and in most conditions.
    MORE

    Latest Satellite Imagery

    East Coast
    West Coast
    Alaska
    Hawaii More Satellite Products
    Latest 3-D weather images from the NOAA's Visualization Laboratory Operational Significant Event Imagery (OSEI) - broadcast, print and web-quality imagery created by the OSEI team of particularly significant or newsworthy environmental events which are visible in available satellite data. Includes dust storms, fire events, flood events, iceberg events, ocean events, severe weather, hurricanes and much more. List of Satellite Industry Related Information Resources - The National Telecommunications and Information Administration's (NTIA) Office of International Affairs (OIA) provides the following list of hypertext links to help monitor developments in the international satellite environment as a public service. NTIA/OIA does not endorse any of the following corporate sites nor vouch for the veracity of information contained in any sites listed. Please email the webmaster if you have additional attractive links.

    14. Satellites
    satellites are subviral agents composed of nucleic acid molecules that depend for their productive multiplication on co-infection of a host cell with a
    http://www.ncbi.nlm.nih.gov/ICTVdb/Ictv/fs_satel.htm
    [Home] [ICTV Taxonomy - Index of Viruses] [Virus Descriptions] [Character List] ... [Search] Subviral Agent: Satellites Nucleic Acid: DNA and RNA General Host: Bacteria, Fungi Invertebrates, Plants
    Agent Satellites
    Definition
    Satellites are sub-viral agents composed of nucleic acid molecules that depend for their productive multiplication on co-infection of a host cell with a helper virus. Satellite nucleic acids have substantially distinct nucleotide sequences from those of the genomes of either their helper virus or host. When a satellite encodes the coat protein in which its nucleic acid is encapsidated it is referred to as a satellite virus.
    Categories of Satellites
    Group 81.001. Satellite Viruses
    Type 81.001.4. Single-Stranded RNA Satellite Viruses
    Subgroup 1: 81.001.4.01. Chronic Bee-Paralysis Virus Associated Satellite
    Subgroup 2: 81.001.4.02. Tobacco Necrosis Virus Satellite
    Group 81.002. Satellite Nucleic Acids
    Type 81.002.2. Single-Stranded Satellite DNAs
    Type 81.002.3.

    15. MySpace.com - Satellites - Mallorca, Mediterranean Sea And London, UK - Experime
    MySpace music profile for satellites with tour dates, songs, videos, pictures, blogs, band information, downloads and more.
    http://www.myspace.com/satelliteslondon
    User Shortcuts: Send Message Forward to Friend Add to Friends Add to Favorites Block User Add to Group Rank User Instant Message People MySpace Web Music Video Home Browse Search Invite ... Artist Signup
    satellites
    Experimental / Rock / Trance
    Mallorca, Mediterranean Sea and London,
    United Kingdom
    Profile Views: 17128
    Last Login: 1/24/2008
    View My: Pics Videos
    Contacting satellites
    MySpace URL: http://www.myspace.com/satelliteslondon
    satellites: General Info Member Since Band Website satellitesmusic.com Sounds Like "Come shining" , extract from "Satellites On Stage" live DVD coming out soon. "Soothe me" , another video from the DVD, song included in our forthcoming 4th album. Type of Label None satellites's Latest Blog Entry Subscribe to this Blog View All Blog Entries About satellites We have been here since life started. We have played in France, in Spain, in New York, Berlin, England, Ireland and Scotland... We live in London, most of the time... We'd love to play anywhere else. Anywhere else is fine, really. We have released 2 albums

    16. Space Today Online - Space Satellites
    NASA artist conception of Terra satellite in orbit above Earth Terra satellite observing Earth Read About Unusual and Interesting Space satellites
    http://www.spacetoday.org/Satellites.html
    'Everything in Space obeys the laws of physics. If you know these laws and obey them, Space will treat you kindly.'
    NAVIGATE STO: COVER SOLAR SYSTEM DEEP SPACE ROCKETS ...
    SPACE TODAY ONLINE
    'Any sufficiently advanced technology is indistinguishable from magic.'
    The Lost Worlds of 2001

    SPACE TODAY ONLINE ~~ COVERING SPACE FROM EARTH TO THE EDGE OF THE UNIVERSE
    Terra satellite observing Earth 50th Anniversary of Sputnik
    and the Dawn of the Space Age

    Navigation Satellites
    Maintenance and repair satellites are coming
    Europe's Amazing Science Satellites
    Satellite Tracking of Endangered Birds, Animals and Fish The A Train of Environmental Satellites Aura, Aqua, Terra SatBytes: Lost Tidbits Uncovered, Forgotten Stories Recovered Amateur Radio Satellites Their Extraordinary History Suitsat leaves the ISS America's Weather Satellites 50 Satellites on Sputnik 50th Anniversary Launching Satellites by Hand Iran Plans to Launch a Satellite
    USAF Research Laboratory The Satellite Wars: Iraq, Afghanistan, Yugoslavia Mt. Everest 50th Anniversary Satellite Portrait About Satellite Orbits Stationary, Polar, Elliptical, Equatorial

    17. Surveillance By Satellite
    In the USA, the only entities that are allowed to own and operate satellites even if they are used to do scientific research, or to provide commercial
    http://www.notbored.org/satellites.html
    satellites:
    the sky has eyes
    There are approximately 120 private companies in the world that operate about a third of the thousands of small, orbiting, uninhabited space vehicles commonly known as satellites; none of these companies are American. In the USA, the only entities that are allowed to own and operate satellites even if they are used to do scientific research, or to provide commercial services relating to communications, entertainment or weather forcecasting is the Department of Defense (DOD) or one of the USA's independent intelligence-gathering agencies: the Central Intelligence Agency (created in 1947), the National Security Agency (1952), the National Reconnaissance Organization (1960), or the National Imagery and Mapping Organization (1996). Foreign governments, private companies and scientific institutions must either pay a fee or enter into an exclusive information-sharing agreement (or both) if they want to get access to America's satellites. In the other countries that have placed satellites in orbit (Russia, China, France, Japan, India, Canada and Israel), the military/intelligence satellites (if any) are kept separate from the commercial ones, and private companies can operate their own satellite systems. This makes sense from an operational point of view. With some exceptions, military satellites are designed to move in complex elliptical orbits around the earth, so that they can photograph very large areas of the surface (whole continents) and determine the locations of sources of certain

    18. NOAA Ocean Explorer: Satellites
    On October 4, 1957, the Soviet Union successfully launched Sputnik I, the world s first artificial satellite. About the size of a basketball, and weighing
    http://oceanexplorer.noaa.gov/technology/tools/satellites/satellites.html
    pharmacy pills pharmacy online tablets ... Observation Tools GOES-2 Satellite before launch. Click image for larger view.
    Alvin
    On October 4, 1957, the Soviet Union successfully launched Sputnik I, the world's first artificial satellite. About the size of a basketball, and weighing only 183 lbs, Sputnik took about 98 minutes to orbit the Earth. While small and limited in function (It carried a tiny radio beacon that beeped at regular intervals.), the Earth's first artificial satellite ushered in an age of exploration not only of space, but of the Earth's land masses and oceans as well.
    GOES and POES
    Geo-stationary views of Earth. Click image for larger view. GOES-3 Satellite. Click image for larger view.
    Sea Surface Temperature and Color
    POES (polar-orbiting environmental satellite). In addition to temperature, satellites also provide information about the color of the ocean. This allows scientists to detect the presence of algal blooms, river plumes, and other events. One satellite used for such efforts is the OrbView-2. This satellite is helping researchers to determine the impact of floods along the coast and to detect blooms of harmful algae (dinoflagellates) that can contaminate shellfish and kill other fish and marine mammals. (Read about Satellites in Use)
    Mapping
    This Landsat image depicts Pearl and Hermes Atoll.

    19. Cosmos4Kids.com: Exploration: Satellites
    Let s start by saying that there are satellites that orbit the Earth. They are unmanned and do not leave the orbit of the Earth.
    http://www.cosmos4kids.com/files/explore_satellite.html
    CIRCLING THE EARTH
    Let's start by saying that there are satellites that orbit the Earth. They are unmanned and do not leave the orbit of the Earth. The first satellite launched into space was Sputnik in 1957. Sputnik was only a tiny metal ball that transmitted a signal for about three weeks. It wasn't until 1962 that the first orbiting satellite provided long-term service to the Earth. That satellite was named Telstar
    ADVANCED SYSTEMS
    After the initial launches, the number of satellites and their complexity has continued to increase. Today there are thousands of man-made objects orbiting the Earth. If you go outside on a very clear night, there is a good chance you will see a bright light speed across the sky. These fast moving objects are often satellites that are reflecting the light of the Sun.
    Many of the first communications satellites were developed by the Hughes company. Those early systems rebroadcast television signals and millions of phone calls. As time passed, that system of satellites became the satellite television system known as DirectTV . There are geostationary satellites that are positioned above North America that transmit television signals to the receiving dishes located on people's houses.
    DIFFERENT ORBITS
    Every satellite has a unique orbit . These specific orbits are set up so that they don't hit each other as they travel through space. Companies and governments have invested millions of dollars into each satellite and it would be very expensive to replace them. There are also different types of orbits for satellites. The four types of orbits you may read about are low earth orbit (LEO), geosynchronous equatorial orbit (GEO), and extreme elliptical orbits. There are different classifications for each of these and you may hear the terms MEO, polar, or HEO. Here's a quick breakdown:

    20. Celestial Mechanics - SATELLITES
    A predominant section of Celestial Mechanics is the satellite visualization sections. The image below was generated from the orbits of Low Orbiting
    http://www.cmlab.com/sats.php
    Celestial Mechanics
    Celestial Mechanics - Low Orbiting Satellites
    A predominant section of Celestial Mechanics is the satellite visualization sections. The image below was generated from the orbits of Low Orbiting Satellites of the Earth, based on data from SSR's (Satellite Situation Reports) collected from the public domain that date from 1994 to the present. Our viewpoint is as if we are standing on the surface of the earth, roughly around the Los Angeles area, looking skyward. In order to generate the image, the data was parsed into MEL, a scripting language used by the 3D animation program Maya, which was then rendered into animation frames. The animation was then sped up to roughly 500x, so the viewer is exposed to the sheer scope of objects that are constantly in orbit. The average speed of an LEO satellite is 17,000 MPH, and the average size is between 1 and 2 meters across. Their functions vary from observation, to data collection, to communication, to military usage. The rings visible in this particular visualization are the satellites' line of site ring, which is the elliptical area of the Earth's surface that each satellite can "see". When each line of site ring is rendered, it is possible to see the scope of observation that is taking place. Below is a still from an animation generated from data in SSR's from June to November, 2005, and a handful of interesting satellites that are currently above the earth. Click the image to toggle the listed satellite locations. Even though they are among hundreds others, the short list of individual satellites shows you many unique functions.

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