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Pluto’s shadow raced across the Pacific Ocean at more than 85,000 kilometers per hour. Planetary scientist Michael Person was on a 747 chasing the shadow, which formed as Pluto passed in front of a distant star. Until last summer, everything researchers knew about Pluto’s atmosphere came from stellar eclipses like this one. But for this June 2015 run,
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, the analysis would get a reality check from the New Horizons spacecraft, which was speeding through the Kuiper belt toward the dwarf planet.
On the night of June 29,
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, Person and his team departed Christchurch, New Zealand, on SOFIA, a jumbo jet fitted with an infrared telescope. Operated by NASA and the German Aerospace Center, SOFIA lofts its telescope,
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, perched within a large hole in the airplane’s side, to an altitude of roughly 12,500 meters,
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, high enough to get above most of the molecules in Earth’s atmosphere that absorb infrared light.
The rendezvous with Pluto’s shadow required precision: The remote world would block the star for just a couple of minutes. And while the entire shadow is as wide as Pluto — 2,
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,374 kilometers — SOFIA was aiming for a 50-kilometer-wide spot at the shadow’s center. At that spot,
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, known as the “central flash,” researchers can get the fullest sense of Pluto’s skies. Partway through the eight-hour flight,
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, plans had to quickly change. Colleagues in Arizona who were monitoring Pluto’s position with a telescope in Chile called to say Person’s team needed to shift the flight

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