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Corey S Powell
Corey S Powell @coreyspowell@mastodon.social  路  4 months ago

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In about 70,000 years, the two massive black holes in this galaxy will collide and release a tremendous burst of gravitational waves.

For now, we can detect them because they blast out light & x-rays each time they waltz through a nearby gas cloud.

https://www.aanda.org/articles/aa/full_html/2024/12/aa51305-24/aa51305-24.html #science #nature

Pan-STARRS stacked image of the AT 2021hdr black hole duo (cross) host galaxy and its environment. The cyan circle indicates the Swift/XRT source position error (90%).
Pan-STARRS stacked image of the AT 2021hdr black hole duo (cross) host galaxy and its environment. The cyan circle indicates the Swift/XRT source position error (90%).
Pan-STARRS stacked image of the AT 2021hdr black hole duo (cross) host galaxy and its environment. The cyan circle indicates the Swift/XRT source position error (90%).
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A 饝惔饝惗饝悷饝惗 (hiti) is an ancient Newah urban water feature: a stepped, sunken courtyard with waterspouts and a central pool. These are fed through a remarkable network of pipes, reservoirs, and irrigation systems drawing water from mountain springs dozens of kilometres away. Every day, hundreds of people from the neighbourhood come to draw water, bathe, and exchange news. They are a unique and precious feature of Newa urban architecture through which neighbourhoods are created.
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