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This flickering swarm exhibits exceptional properties, including a large and bright radio halo and extraordinarily high temperatures. This cluster of galaxies is a member of the Abell catalog, an all-sky catalog of over 4,000 galaxy clusters. This one in particular happens to be the hottest cluster recorded in the catalog! Observing massive clusters like this can help us study dark matter and provide a new perspective on the distant Universe via phenomena such as gravitational lensing. Credit: ESA/Hubble & NASA
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Rhea is a heavily-cratered, airless world, while Titan’s nitrogen-rich atmosphere is even thicker than Earth’s. This natural color image was taken in visible light by the Cassini spacecraft on Nov. 19, 2009, at a distance of approximately 713,300 miles (1,148,000 kilometers) from Rhea. After a nearly 20-year mission that overflowed with discoveries, the Cassini spacecraft ended its mission on Sept. 15, 2017. Credit: NASA/JPL-Caltech/Space Science Institute
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