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American Focus > Blog > Tech and Science > What Are ORCs? Astronomers Still Don’t Know
Tech and Science

What Are ORCs? Astronomers Still Don’t Know

Last updated: April 19, 2025 5:35 pm
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What Are ORCs? Astronomers Still Don’t Know
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Astronomers are constantly scanning the skies, searching for new and exciting celestial objects. With advancements in technology and new capabilities in observing different wavelengths of the electromagnetic spectrum, astronomers have the opportunity to discover previously unknown structures in the universe. In 2019, astronomers made a groundbreaking discovery when they found multiple examples of a new class of objects using the Australian Square Kilometer Array Pathfinder (ASKAP) telescope in Western Australia.

These newfound celestial objects, dubbed Odd Radio Circles (ORCs), presented a unique challenge to astronomers. Unlike anything seen before, these objects appeared as large, circular structures in the sky. Typically, circular shapes in astronomy indicate spherical shells, like soap bubbles, formed by dying stars releasing gas into space. However, the ORCs did not match any known structures and were invisible in other wavelengths of light, adding to the mystery surrounding their origin.

The first discovered ORC, ORC 1, provided a clue to its source when astronomers found an elliptical galaxy emitting visible and infrared light at its center. This galaxy, located five billion light-years away, is a staggering two million light-years across, making it one of the largest structures ever observed. Further observations revealed more ORCs, some with galaxies at their centers, suggesting a potential connection between these objects.

Various theories have been proposed to explain the formation of ORCs, including the influence of supermassive black holes and galaxy group collisions. Recent studies have shown that energetic processes, such as black hole emissions and galaxy mergers, could create the unique structures observed in ORCs. Additionally, the discovery of ORCs with different characteristics, such as the Cloverleaf emission, suggests that these objects may have diverse origins, ranging from supernova remnants to galaxy group interactions.

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As astronomers continue to study ORCs and gather more observations, they hope to unravel the mysteries surrounding these enigmatic objects. By classifying and understanding the formation mechanisms of ORCs, scientists aim to expand our knowledge of the universe and uncover the complex processes at work in the cosmos. The discovery of ORCs highlights the ongoing quest to explore and comprehend the vast and diverse phenomena present in the heavens.

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