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π1 Gruis

The contours seen on the surface of the red giant π1 Gruis are heat convection cells, in which hot plasma moves up from the depths of the star, cools, and returns back inside. Despite the blur in the image, she breaks new ground in her ability to observe the star's disk from a distance of 530 light years, and for the first time identify this phenomenon directly on a star other than our sun. Source: ESO.

Astronomers discovered huge "bubbles" on the face of a red giant

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