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Earth

Past

These missions explored the boundaries of our understanding of the complex, dynamic system we call the Earth.  They have been retired, but are not forgotten.  We hope they inspire the next generation of explorers by providing opportunities for learners of all ages to discover the exciting past efforts by NASA in its research.

Under Study

Missions begin with a study phase during which the key science objectives of the mission are identified, and designs for spacecraft and instruments are analyzed. Study teams are constituted to define measurement and mission elements and deliver achievable objectives with a specific cost and scope. Study teams are managed by a Project scientist, a Program Executive at NASA Headquarters, and a Program office.

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