Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) captured the radio image of 46P/Wirtanen on December 2, 2018, when the comet was about 10.3 million miles (16.5 million km) from Earth. ALMA image of 46P/Wirtanen taken on December 2, 2018, as the comet approached Earth. The image shows the concentration and distribution of HCN molecules near the center of the comet’s coma. Image credit: ALMA / ESO / NAOJ / NRAO / M. Cordiner...
