Twenty comets captured in infrared by NASA's Wide-field Infrared Survey Explorer (WISE) Credit: NASA/JPL-Caltech/UCLA

Wise541727main_image_1938_946-710

A collage of the 20 comets captured by the WISE mission, which mapped the entire sky in infrared light. Credit: NASA/JPL-Caltech/UCLA

Download this image:

WISE541727main_image_1938_946-710.jpg