Over the decades astronomers have taken urgent steps to slow or even reverse its spread. To the south, across the Mexican border, loomed another luminous half-circle from the lights of Nogales.Īll that light is an existential threat to high-grade stargazing on Kitt Peak. A snake of lesser lights-Interstate 10-wriggled out from the glow, winding 100 miles north toward the glare of Phoenix. Tucson was a bright bubble eating the eastern sky and the shoulder of Orion.
“Holy crap,” Edwards said, taken aback by the enormous city glow. As the stars came out, electric lights dotting the landscape below turned on, too, leaving a diminished Milky Way arcing above the brighter civilization. But on this evening last December she stood alongside me in the twilight, watching two worlds collide. At this hour Michelle Edwards, the observatory's associate director, would usually be inside prepping for a night on the telescope. Darkness was falling at Kitt Peak National Observatory outside Tucson, Ariz.
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