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David H. Levy's Evening Stars: An observing trip in time

July 2010: Gazing at the skies takes on a new level of wonder when you consider your place in history.
July 2010 Jupiter and moons
Jupiter and its four largest moons always make for a stunning sight, whether 400 years ago or today. This composite image is not to scale, but shows the moons in their relative positions (from top to bottom: Io, Europa, Ganymede, and Callisto).
NASA/JPL
Thin white clouds crisscrossed the deep-blue sky late in the afternoon of Friday, January 8. As the Sun dipped below the southwestern horizon, I had the eerie feeling that comes from repeating a nearly 50-year-old observing session.

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