Coming attraction: Evidence is mounting for detection of a second interstellar visitor

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Coming attraction: Evidence is mounting for detection of a second interstellar visitorTwo years after astronomers made their first detection of a celestial object that came into our solar system from the neighborhood of another star, they think they've spotted another one. The comet, known as C/2019 Q4 (Borisov), was discovered on Aug. 30 by Gennady Borisov at the MARGO observatory in Crimea, a region that's contested by Ukraine and Russia. C/2019 Q4's origin hasn't yet been fully confirmed, but each night brings further evidence that its path traces back to far beyond our solar system. In a Thursday update, NASA reports that C/2019 Q4 is 260 million miles from the sun… Read More


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