As recently as February, the green comet C/2022 E3 (ZTF) was seen on one of its rare rendezvous with Earth. This celestial body only passes by the earth every 50,000 years. The green color comes from a gas produced by heating near the sun. C/2022 E3 (ZTF) is so named because it was first seen from an observatory in the United States last year as part of the Zwicky Transient Facility program.