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Ancient Observatories, Timeless Knowledge

Sun-Earth Day Presents: Ancient Observatories, Timeless Knowledge

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HENA image of a portion of the Ring Current with Earth superimposed. The current is not smooth, and often does not completely encircle the equatorial zone of Earth. It is more prominent on the night time side, and as it moves into the dayside it breaks up and vanishes, possibly by losing particles into the magnetopause region.Learn More»

Photo: IMAGE

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