Fermi’s Bubbles

Astronomers have found radio-emitting structures jutting out from our galaxy’s black hole:

These bubbles are big. Top to bottom, the cosmic hourglass measures 1,400 light-years, a distance that, if converted into miles, comprises of a dizzying number of zeros; one light-year—the distance that light covers in an Earth year—is about 6 trillion miles. The black hole, by comparison, is a pinprick of light.


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