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Sarah Kaplan

The comet that could hold the secrets of the cosmos

First spotted on August 30 from Crimea by a self-taught astronomer, comet 2I/Borisov holds a key to worlds astronomers cannot directly observe.

Alexandria Villasenor has missed school each Friday since December to protest outside UN headquarters in New York about climate change, and the 13-year-old has won support from like-minded youngsters around the planet.

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