NASA launched the Earth Observing System's flagship satellite "Terra," named for Earth, on December 18, 1999. Terra has been collecting data about Earth's changing climate. Terra carries five state-of-the-art sensors that have been studying the interactions among the Earth's atmosphere, lands, oceans, and radiant energy. Each sensor has unique design features that will enable scientists to meet a wide range of science objectives. The five Terra onboard sensors are:
ASTER, or Advanced Spaceborne Thermal Emission and Reflection Radiometer
CERES, or Clouds and Earth's Radiant Energy System
MISR, or Multi-angle Imaging Spectroradiometer
MODIS, or Moderate-resolution Imaging Spectroradiometer
MOPITT, or Measurements of Pollution in the Troposphere.