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53K views · 2.8K reactions | LIVE NOW: Ask us anything about asteroid 1998 OR2, interstellar comet Borisov and comet ATLAS. Asteroid 1998 OR2 will safely fly by Earth on April 29. Join our Planetary Defense experts on Reddit to ask questions about comets and asteroids: https://www.reddit.com/r/askscience/comments/g9o4yp/askscience_ama_series_we_are_the_nasa_alma_and/ | NASA - National Aeronautics and Space Administration | Facebook
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