Comet Holmes (left) from the 3.6-meter Canada-France-Hawaii telescope on Mauna Kea showing the coma at 869,900 miles (1.4 million kilometers) in diameter. The white ''star'' near the center of the coma is in fact the dust-shrouded nucleus of the comet.The sun and the planet Saturn are shown at the same scale for comparison. Credit: University of Hawaii/CFHT (comet); NASA/Voyager (Saturn); NASA/ESA/SOHO (sun)