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In honor of Valentine's Day, we look at celestial star pairs and constellation couples. A pair of star clusters will be visible throughout the month after sunset. The Perseus Double Cluster will be high in the sky near Andromeda’s parents: Cepheus and Cassiopeia. Watch to see what else you’ll be able to spot in February! 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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