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2017 YZ4: Newly
JAY GORY, MANAGING EDITOR, science
Updated | On Christmas Day, astronomers at the Mount Lemmon Survey near Tucson, Arizona, discovered an asteroid fast approaching Earth. The asteroid's trajectory is marked in green. Lindley Johnson, Planetary Defense Officer at NASA's Science Mission Directorate in Washington, D.C, tells Newsweek: “2017 YZ4 is the 52nd known asteroid to fly by Earth within one lunar distance this year and the first since two such asteroids flew past us on November 21. read more


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