A POSSIBLE INTERSTELLAR COMET: A new comet just discovered by amateur astronomer Gennady Borisov is rocketing through the solar system too fast for the sun's gravity to hang onto it. Indeed, it appears to be a visitor from the stars. Interstellar Comet Borisov will make its closest approach to the sun and to Earth in Dec. 2019. Get the full story and observing tips on today's edition of Spaceweather.com
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Above: Comet Borisov is currently beyond the orbit of Mars. Click here to play with a 3D visualization of the comet's approach courtesy of the Jet Propulsion Laboratory.
