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On this day in space! Sept. 11, 1985: The International Cometary Explorer makes 1st comet flyby in history for NASA and Europe
space.com · 3d
On Sept. 11, 1985, the International Cometary Explorer, or "ICE," became the first spacecraft to fly by a comet. Here's why it mattered.
First report: Sept. 11, 1985: The ICE probe encounters Comet Giacobini-Zinner — astronomy.com, 3d
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