Echo of a Silenced Black Hole express
Original: "Polarization echoes from past nuclear activity in the quasi-periodic eruption source GSN 069"
Light from the center of galaxy GSN 069, like an echo, brought news: the giant black hole was recently active but has now fallen asleep.
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Polarized light from the galaxy's center gave away a secret: the monster black hole there has already switched off, but its past activity is still visible in reflections. This is how astronomers peer into the universe's past.
🎯 Light echoes expose cosmic events with a delay that makes us witnesses of the distant past—as if we're watching a film shot thousands of years ago.