At 5:30 a.m., the countdown reached zero and the voice on the loudspeaker said, “Now.” A pinprick of searing white light expanded almost instantly to become a small sun, half a mile in diameter, and the predawn darkness vanished in a cosmic flash, as blinding as a photographer’s flashbulb. For a moment, the desert was lit to the horizon by a noonlike brightness, until most of the light was suddenly sucked back into the vortex of the blast, or so it appeared to the witnesses. Ascending, the great orb seemed to liquefy and dissolve into boiling neon colors, a mesmerizing kaleidoscope of gold,
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