Captured just days after its discovery, the images offer the clearest view yet of this rare visitor from beyond our solar system.

Researchers got an up-close look at the largest comet ever observed, C/2014 UN271, hurtling toward the sun from the Oort Cloud and measuring 85 miles across with jets of carbon monoxide gas.

The comet appears to burn a bright, lime green color in photographs. But Fraknoi says don't look for something green in the sky. "The naked eye just shows a fuzzy white glow," he said.

Astronomers recently got a close-up look at the comet, known as C/2014 UN271, flying through deep space with the powerful Atacama Large Millimeter/submillimeter Array (ALMA) radio telescope in Chile.

Right now, with a telescope, Comet SWAN is visible before sunrise if you’re looking along our east-northeast horizon. It might be hard to see even with binoculars.