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Content Developed By: Alan Ward
Designed By:: Winnie Humberson
Edited By: Margaret Baguio, Bill Bandeen, Charlotte Griner, Michael King, Margaret Srinivasan.
Technical Input Provided By: Christoph Reigber, Rick Fitzgerald, Frank Flechtner, Bob Garnett, Marc Imhoff, Byron Tapley, Srinivas Bettadpur, John Ries, Don Chambers, Ab Davis, Mike Watkins.
Front Cover Foreground:

These images show three different views of the Earth's geoid - a surface of equal gravitational potential that, over the ocean, closely follows the sea surface.The geoid was determined from data collected by previous satellite missions.Among these satellites is the Challenging Minisatellite Payload (CHAMP), the forerunner to GRACE, launched by the German Georesearch Center GeoForschungsZentrum Potsdam(GFZ). Similar products will be developed using data from GRACE with an expected improvement in accuracy of several orders of magnitude.These images were provided courtesy of GFZ. The illustration of the GRACE satellites was provided by Chris Meaney.

Front Cover Background:

This day/night image of the Earth was produced using a combination of data from the Moderate Resolution Imaging Spectrometer (MODIS) sensor aboard NASA’s Terrasatellite (daytime portion), and the city lights image produced using Operational Line Scan(OLS) data from the Defense Meteorological Satellite.The daytime side of the Earth in this image was made using surface reflectance data from MODIS.The data was composited over a period of several months during the Northern Hemisphere of summer 2001.(Image courtesy of Robert Simmon and the MODIS Science Team.)

Back Cover:

This is a photograph of the two identical spacecraft in the environmental test facility at Industrieanlagen-Betriebsgesellschaft GmbH (IABG) in Ottobrun, Germany. When deployed into space, the two craft will be upright inside the launch vehicle. After launch,they will fly 500 km above the Earth and will be separated by 220 km.The photograph was provided courtesy of Astrium GmbH.

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The GRACE mission is jointly implemented by NASA and DLR under
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Last Modified: Tue Feb 10, 2004