Each OGO spacecraft was developed to study the movements of Earth, and determine how our planet interacts with the sun. The satellites remained stalwart in that mission for a solid five years before NASA shut the project down.
https://www.techspot.com/news/86615-nasa-ogo-1-satellite-has-finally-returned-earth.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/86615-nasa-ogo-1-satellite-has-finally-returned-earth.html?utm_source=dlvr.it&utm_medium=blogger