Aurora Watch
AURORA WATCH: An ongoing geomagnetic storm could spark auroras tonight bright enough to see with the unaided eye from, e.g., Canada and northern-tier US states such as Maine and Wisconsin and Washington. Dim "photographic auroras" (visible to the camera, but not to the eye) could descend to even lower latitudes. Visit spaceweather.com for updates.
THE MOON AND MARS: On Tuesday morning, May 31st, the Moon and Mars will have a beautiful close encounter in the early morning sky. To see them, look east about an hour before dawn. Mars, nestled close to the Moon, is almost twice as bright as a first magnitude star.
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