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Solar Terrestrial Relation Observatory

Space Agency:
Orbit:
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State of spacecraft:
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NASA
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Ecliptic orbit, Co-rotating with the Earth around the Sun
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On Oct. 1, 2014 loss of communication of STEREO-B. STEREO-A continues to operate normally
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Purpose:
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Results:
Composed of two nearly identical observatories - one ahead of Earth in its orbit, the other trailing behind - STEREO has traced the flow of energy and matter from the Sun to Earth.
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Has provided scientists a unique and revolutionary view of the Sun-Earth System, like a 3D structure of coronal mass ejections.

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