A total solar eclipse plunged Antarctica from summer into darkness early Saturday in a rare astronomical spectacle witnessed by a handful of scientists and thrill-seekers – and countless penguins.“The visibility was excellent,” said Raul Cordero of the University of Santiago de Chile (USACH), who was on site to witness “totality” at 0746 GMT, with the “Ring of Fire” phase lasting just over 40 seconds.Solar eclipses occur when the Moon passes between the Sun and Earth, casting its shadow on…

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