A Magnetar's Flare Just Helped Unlock the Secrets of These Strange Stars

Magnetars are the most magnetic objects in the universe, and they should be relatively common. Yet, astronomers have had a hard time studying them.

By Eric Betz
Jan 21, 2021 8:00 AMJan 25, 2021 4:00 PM
Magnetar - ESO
An artist’s impression of a magnetar. (Credit: ESO/L. Calçada/Wikipedia)

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Roughly 11.5 million years ago in a galaxy not too far away, a starquake cracked the surface of a small and violent stellar corpse. This rupture caused an enormous flare that sent X-rays and gamma rays racing across the universe. After traveling for millions of years, the flood of high-energy radiation finally washed over our inner solar system just before 5 A.M. EST on April 15, 2020, lighting up the sensors of spacecraft orbiting the Sun, Earth, and Mars. The signal lasted just a fraction of a second, but it still offered telltale clues about where it came from. 

And last week, a team of scientists studying the event announced they've deduced the bizarre origins of this cosmic flood of radiation. The signal came from a strange star called a magnetar — short for magnetic star — an extreme object that packs the mass of our Sun into a city-sized sphere. 

Magnetars should be commonplace in the universe. Yet, they’ve proven hard to track down and study. That’s why astronomers are so excited by this magnetar flare: It could teach us a lot about these elusive stars. Their findings were described in a handful of papers published January 13 in Nature and Nature Astronomy

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