What is causing the mysterious, enormously loud roar coming from the distant cosmos? Astronomers at NASA have been looking for faint signs of heat from the universe’s early stars. What they’ve discovered, instead, is an electromagnetic “roar” from the far reaches of space. The signal is six times stronger than the combined radio emissions previously known in the universe. “This is what makes science so exciting,” says Michael Seiffert of NASA’s Jet Propulsion Laboratory. “You start out on a path to measure something—in this case, the heat from the very first stars—but run into something else entirely, some unexplained.”
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