A team of Japanese astronomers has made a surprising discovery: they’ve found an atmosphere around an icy object far beyond Pluto. This finding, published in *Nature Astronomy*, challenges what we thought we knew about celestial bodies in the Kuiper Belt, a region filled with icy worlds.
The object, known as (612533) 2002 XV93, is small and cold, measuring about 311 miles (500 kilometers) across—significantly smaller than Pluto. Scientists believed it was too tiny and frigid to hold an atmosphere. Yet, new observations indicate otherwise, suggesting this distant body might support a thin gas layer.
In January 2024, researchers captured data while this object passed in front of a distant star. They noticed a gradual dimming of the star’s light, which hints at the presence of an atmosphere that could bend light. “The smooth change in brightness suggests starlight is influenced by a very thin atmosphere around the object,” explained Ko Arimatsu, a lead researcher from Japan.
Experts, including planetary scientist Alan Stern, have expressed excitement but also caution. “This is an amazing development, but it needs independent verification,” he remarked. He pointed out that verifying these findings could significantly alter our understanding of atmospheres in the solar system.
Initial data show that this atmosphere is extremely thin, around 5 million to 10 million times less dense than Earth’s atmosphere, making it uninhabitable. It may not even last for long—less than 1,000 years—unless replenished by some process.
One theory is that ice volcanoes could release gases to maintain the atmosphere, while another suggestion is that a collision with an icy body, like a comet, might have sent gases skyward. Future observations, particularly with the James Webb Space Telescope, are crucial in solving this cosmic puzzle. As Arimatsu noted, if the atmosphere disappears within a few years, it would lean towards the impact theory. But if it stays or fluctuates, it might hint at a more continuous internal gas source.
This intriguing discovery invites us to rethink our views on what kinds of objects can support atmospheres, especially those located in the cold reaches of our solar system. As we continue exploring, who knows what other surprises the universe holds in store?
For deeper insights into this discovery, check out the official study [here](https://doi.org/10.1038/s41550-026-02846-1).
