June 2016: How we discovered planet nine

This month's issue of Astronomy magazine has the first-hand account of the astronomers who discovered Planet Nine, tells the story of Vera Rubin and dark matter, explores how to preserve American's last dark skies, introduces the upcoming Asteroid Day, and more.
By | Published: April 25, 2016 | Last updated on May 18, 2023
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Astronomy offers you the most exciting, visually stunning, thorough, and timely coverage of the heavens above. Each monthly issue includes expert science reporting, vivid color photography, complete sky-event coverage, spot-on observing tips, informative equipment reviews, and more. All of this comes in an easy-to-understand user-friendly style that’s perfect for astronomers at any level. Contact Astronomy, the world’s best-selling astronomy magazine, at 262.796.8776 or email editor@astronomy.com.