Comet Double Whammy: Photos of 21P/Giacobini-Zinner and 46P/Wirtanen by Stargazers
Thursday, September 6, 2018 - 06:40
in Astronomy & Space
See photos of Comet 21P/Giacobini-Zinner and the naked-eye comet 46P/Wirtanen, which will swing around the sun in September and December.