Comet 31/Atlas has captured the world’s attention after astronomers confirmed it originated from another star system, making it an interstellar object. That means this mysterious traveler is merely passing through our solar neighborhood before continuing its journey into deep space.

Discovered earlier this year by the Pan-STARRS telescope in Hawaii, 31/Atlas has displayed a series of fascinating transformations. Scientists have confirmed that the comet has changed color for the third time since entering our solar system — a phenomenon that’s sparking new scientific debate and excitement.

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Star System Visitor Color-Shifting Mystery

Astronomers first observed 31/Atlas glowing green, a hue likely caused by carbon gases common in comets. Later, it turned blue-white, and more recently, it has taken on a reddish tone.

Dr. Mei Lin, an astrophysicist at the National Astronomical Observatory of Japan, explained, “These color changes suggest that sunlight is reacting with the comet’s surface materials — possibly ice, gas, and dust — causing them to heat, vaporize, and chemically alter.”

Experts say such changes give vital clues about what interstellar objects are made of. “Each color shift is a message from the comet,” said space researcher Dr. Alan Gupta. “It tells us how alien materials respond to our Sun’s radiation.”

What Scientists Are Learning

The discovery of 31/Atlas marks only the third known interstellar object ever detected — following ‘Oumuamua in 2017 and 2I/Borisov in 2019. Studying it could help scientists understand the chemical makeup and behavior of materials that formed around other stars.

Researchers across Hawaii, Chile, Japan, and the Canary Islands are tracking its movement and brightness to determine whether 31/Atlas is more like a comet, an asteroid, or something else entirely. Because the Sun’s gravity does not bind the object, it will soon exit our solar system, never to return.

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Comet 3I/ATLAS Is Leaving the Solar System: How To See It Before It’s Gone - Newsweek

3I/Atlas continues to surprise scientists after changing color for the third time since entering our solar system

How to See 31/Atlas Before It’s Gone

Stargazers in the Northern Hemisphere will have a final opportunity to glimpse 31/Atlas this December. On December 19, it will pass within 168 million miles of Earth, roughly 1.8 times the distance between our planet and the Sun.

Then the star system visitor will drift away forever.

Skywatchers using large backyard telescopes may be able to spot the comet as it moves northward in the night sky, glowing faintly as it retreats into the darkness of interstellar space.

As Dr. Lin summarized, “It’s a once-in-a-lifetime event — a true messenger from another world.”