Green Comet Gets Kicked From Solar System Forever

A glowing green comet is saying goodbye to our solar system this week, and astronomers are capturing its stunning farewell tour.

Comet Wierzchoś will make its closest approach to Earth on Tuesday, February 17, passing about 94 million miles away. That's roughly the same distance as the sun, close enough for stargazers to catch a glimpse of its rare green glow and lengthy tail.

Polish astronomer Kacper Wierzchoś discovered the icy visitor in March 2024 using a telescope at Mount Lemmon Observatory in Arizona. The comet's nucleus stretches roughly 8.5 miles across, about two-thirds the length of Manhattan.

What makes this comet special is its hyperbolic trajectory, which means it follows an open, flattened path rather than circling back around the sun. Scientists believe it has been slowly falling toward our star for up to 3 million years after originating from the Oort cloud, a vast reservoir of icy objects at the edge of our solar system.

The James Webb Space Telescope recently studied the comet and detected large amounts of carbon dioxide in its coma, the cloud of gas and dust surrounding its icy core. This is likely the first time Comet Wierzchoś has ever ventured into the inner solar system.

After passing its closest point to the sun on January 20, the comet got a gravitational kick that will permanently eject it from our neighborhood. Experts say it could take decades or even centuries to officially leave the solar system, but once it does, it will drift through the Milky Way for billions of years.

Why This Inspires

This cosmic farewell reminds us how vast and dynamic our universe truly is. Comet Wierzchoś has been on an epic journey for millions of years just to pass through our corner of space once, and now it will carry a piece of our solar system's story to distant star systems we may never reach ourselves.

The comet joins other interstellar travelers like 3I/ATLAS, which made headlines last year as it zoomed through our solar system after being kicked out by its home star long before our sun was born. These cosmic wanderers connect us to the broader galaxy in ways we're only beginning to understand.

Scientists can study these rare visitors to learn about the building blocks of planetary systems and how objects move through space over unimaginable timescales.

This week offers a rare chance to witness a once-in-forever event as Comet Wierzchoś lights up our sky one last time before beginning its eternal journey through the stars.