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Heart and soul

NASA's Wide-field Infrared Survey Explorer recently recorded this false-color mosaic of two vast star-forming regions in the Milky Way about 6,000 light-years from Earth: the Heart nebula (right) and the Soul nebula (left). Two much more distant bodies lie near the bottom of the image: the elliptical galaxy Maffei 1 (blue) and the spiral galaxy Maffei 2, each about 10 million light-years from Earth. Blue and cyan represent infrared light at wavelengths of 3.4 and 4.6 micrometers, which is dominated by starlight. Green and red represent light at 12 and 22 micrometers, which is mostly emitted by warm dust. Credit: JPL-Caltech/NASA, UCLA

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