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Glossary
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 EDL
- Entry, Descent and Landing
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EOS
- Earth Observing System
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EOSDIS
- EOS Data and Information System
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EPA
- Environmental Protection Agency
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EPO
- Education and Public Outreach
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EPO
- Education and Public Outreach. See Opportunities in Science Mission Directorate Education and Public Outreach.
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ESA
- European Space Agency
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ESIP
- Federation of Earth Science Information Partners
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ESMD
- Exploration Systems Mission Directorate
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ESSP
- Earth System Science Pathfinder
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ESTO
- From instruments to data access, the NASA Earth Science Technology Office (ESTO) develops technologies that enable a full range of scientific measurements, operational requirements, and practical applications that benefit society at large.
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Echo Sounders
- Devices that use sound waves to measure the depth of surface water bodies.
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El Nino
- Warm-water conditions off the western tropical coasts of the Americas, occurring irregularly but usually around Christmastime, caused by weakening trade winds and causing depleted fisheries, heavier-than-normal rain in the central and eastern Pacific, and drought in the western Pacific.
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Ephemeris
- An ephemeris is a tabulation of computed positions and velocities (and/or various derived quantities such as right ascension and declination) of an orbiting body at specific times. The plural form of ephemeris is ephemerides. In the context of this web-site, solar system bodies are implied.
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ecosystems
- the complex of a community of organisms and its environment functioning as an ecological unit
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emissions
- The production of light, or more generally, electromagnetic radiation by an atom or other object.
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equilibrium
- the state where conditions in a fluid are uniform or changing only slowly
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extra solar planets
- Planets around stars other than the Sun.
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