http://www.newsweek.com/green-comet-appear-february-night-sky-never-return-earth-1772429 > Professional and amateur skywatchers are tracking a "green" comet zooming through space that could soon be visible to the naked eye from Earth. But why does this comet and others like it often appear to be green? > Comet C/2022 E3 (ZTF) is currently located around 74 million miles from Earth and is set to reach its closest point to the sun, or perihelion, on January 12, 2023.