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Retired cancer surgeon. Enjoys golf and astronomy.
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif June 26, 2026
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif April 26, 2026
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif April 8, 2026
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif March 24, 2026
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif March 11, 2026
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif February 10, 2026
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif February 2, 2026
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif January 26, 2026
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif December 6, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif November 7, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif November 6, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif November 6, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif October 27, 2025
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