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Filaments are cooler and often unstable clouds of particles floating above the Sun’s surface, which are tethered by magnetic forces. In extreme ultraviolet light, they appear darker than the Sun’s surface. The bright area to the right of the filament is an active region. The loop that appears behind the filament in the middle of the clip is made of charged particles tracing magnetic field lines. Credit: 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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