October 19, 2025

STEREO spacecraft

  • NASA’s Solar Terrestrial Relations Observatory (STEREO-A) spacecraft made its first Earth flyby, nearly 17 years after its launch.
  • Launched from Cape Canaveral on October 25, 2006, the twin STEREO spacecraft, STEREO-A (“Ahead”) and STEREO-B (“Behind”), embarked on their mission to chart Earth-like orbits around the Sun.
  • Their primary objective was to provide the first stereoscopic, or multiple-perspective, view of our closest star.
  • On February 6, 2011, the mission achieved a significant milestone when the two spacecraft reached a 180-degree separation in their orbits, allowing humanity to see the Sun as a complete sphere for the first time.

 

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