The Earth Observing System (EOS), centerpiece of NASA's Earth Science Enterprise (ESE), consists of a coordinated series of satellites for long-term global observations of the Earth.

The flagship in NASA's Earth Observing System (EOS), Terra launched on December 18, 1999, and began collecting science data on February 24, 2000. Visit the Images and Data section for details on ordering data as well as status updates on all the sensors data products. Click the buttons to the right to read the latest releases about new Terra data products. Return here often to see the latest ...

To be launched in 2001, Keo will fly through time and space for 50, 000 years before returning to Earth to deliver everyone's message to future generations ...

The mission of the Explorers Program is to provide frequent flight opportunities for world-class scientific investigations from space utilizing innovative, streamlined and efficient management approaches within the following space science themes: Astronomical Search for Origins and Planetary Systems, Structure and Evolution of the Universe, The Sun-Earth Connection. The program seeks to ...

The official Southwest Research Institute IMAGE mission Web site ...

Sputnik, the first artificial satellite. This website was created for the 40th commemoration of the beginning of the Space Age.

Vanguard: A History by Constance McLaughlin Green and Milton Lomask The NASA Historical Series NASA SP-4202 National Aeronautics and Space Administration Washington, DC Published 1970 Very special thanks to Sasi Tumulari for formatting this on-line version and to Hans-Peter Engel for scanning the photos, adding the electronic images, and proofreading. Go to the Table of Contents. Updated October ...

National Aeronautics and Space Administration Office of Policy and Plans NASA History Office Explorer Series of Spacecraft Over the comparatively short but eventful history of the U.S. space program, a large number of spacecraft -- including the very first American satellite launched by the Army Ballistic Missile Agency on January 31, 1958 -- have borne the name, Explorer. All of these vehicles ...

Scientists used oscilloscopes like this one to analyze Sputnik's signals. You can listen to the sound of Sputnik in AU format (110K) or in RealAudio. Credit: NASA History Office t was 500 miles up, traveling at 18, 000 miles an hour, and it circled the globe every 96 minutes. It flew over the U.S. seven times a day. And the sound of its incessant beeping fascinated and disturbed the nation. At ...