Comet ZTF, as photographed on January 18, 2023.Dan Bartlett A green comet and Mars will appear side-by-side in the night sky on February 10 and 11. It's a good opportunity to spot the comet in the early evening, maybe with just binoculars. Here's what you need to know to see the colorful cosmic couple. A green comet shooting past Earth for the first time since the Ice Age is about to skim right past Mars in the night sky.The green comet and the red planet will be visible side-by-side across the Northern Hemisphere on the nights of February 10 and 11.