Glossary – E
Devices that use sound waves to measure the depth of surface water bodies.
the complex of a community of organisms and its environment functioning as an ecological unit
Entry, Descent and Landing
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.
The production of light, or more generally, electromagnetic radiation by an atom or other object.
Earth Observing System
EOS Data and Information System
Environmental Protection Agency
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.
Education and Public Outreach. See Opportunities in Science Mission Directorate Education and Public Outreach.
the state where conditions in a fluid are uniform or changing only slowly
European Space Agency
Federation of Earth Science Information Partners
Exploration Systems Mission Directorate
Earth System Science Pathfinder
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.
Planets around stars other than the Sun.
