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The black holes orbiting each other. Both black holes have jets associated with them: the larger one in red, the smaller one in yellow. Normally only the red jet is visible, but in the 12 hours on November 12, 2021 the small jet was dominant, giving a direct signal from the smaller black hole, and was observed for the first time. Credit: NASA/JPL-Caltech/R. Hurt (IPAC) & M. Mugrauer (AIU Jena)

The black holes orbiting each other. Both black holes have jets associated with them: the larger one in red, the smaller one in yellow. Normally only the red jet is visible, but in the 12 hours on November 12, 2021 the small jet was dominant, giving a direct signal from the smaller black hole, and was observed for the first time. Credit: NASA/JPL-Caltech/R. Hurt (IPAC) & M. Mugrauer (AIU Jena)

The black holes orbiting each other. Both black holes have jets associated with them: the larger one in red, the smaller one in yellow. Normally only the red jet is visible, but in the 12 hours on November 12, 2021 the small jet was dominant, giving a direct signal from the smaller black hole, and was observed for the first time. Credit: NASA/JPL-Caltech/R. Hurt (IPAC) & M. Mugrauer (AIU Jena)

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