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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 October 6, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif September 22, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif August 24, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif August 22, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif July 29, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif July 2, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif June 21, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif June 3, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif May 13, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif May 1, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif April 25, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif April 13, 2025
Astronomy Pictures: Sky & Telescope's Online Gallery
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By: Jon Greif April 9, 2025
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