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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Dry Ice Found in a Planetary Nebula for the First Time – A Cosmic First!

In a groundbreaking discovery, astronomers have detected dry ice—frozen carbon dioxide—in a planetary nebula for the very first time. This remarkable finding, made possible by the powerful eyes of the James Webb Space Telescope (JWST), opens new windows into understanding the chemistry of dying stars and the cosmic environments they leave behind.

The discovery was detailed in a research paper by Charmi Bhatt and colleagues from the University of Western Ontario, Canada, published on February 25, 2026, on the arXiv pre-print server. Using JWST’s Mid-Infrared Instrument (MIRI), the team carefully studied the planetary nebula known as NGC 6302, uncovering clear evidence of carbon dioxide ice within its dusty structures.

What Are Planetary Nebulae?

Planetary nebulae (often abbreviated as PNe) are some of the most beautiful and intriguing objects in our galaxy. Despite the name, planetary nebulae have nothing to do with planets. The term was coined in the 18th century because, through early telescopes, they appeared round and planet-like.

PNe are created during the final stages of a star’s life. When stars similar in size to our Sun exhaust their nuclear fuel, they shed their outer layers of gas and dust into space, forming expanding shells around a central stellar remnant. This remnant eventually becomes a white dwarf.

Though relatively rare, planetary nebulae play a crucial role in enriching the interstellar medium (ISM)—the vast space between stars—with chemical elements such as carbon, nitrogen, and oxygen. These elements are essential building blocks for new stars, planets, and potentially life.

Meet the Butterfly Nebula – NGC 6302

NGC 6302, famously nicknamed the Butterfly Nebula or Bug Nebula, is one of the most complex planetary nebulae ever observed. Located about 3,400 light-years away in the constellation Scorpius, it spans a radius of at least 1.5 light-years.

The nebula is a bipolar planetary nebula, meaning it has two large lobes extending in opposite directions. These lobes are bright and oriented east-west, with a massive dusty torus slicing through the middle. The dust torus acts like a cosmic belt, shaping the overall structure of the nebula and protecting parts of it from the harsh radiation of the central star.

Previous studies of NGC 6302 had already hinted at its chemical complexity. Astronomers found methyl cation (CH3+), a molecule that fuels organic chemistry, and polycyclic aromatic hydrocarbons (PAHs), large carbon-rich molecules that are important for prebiotic chemistry. These findings suggested that NGC 6302 is a natural laboratory for studying how complex chemistry unfolds in the later stages of a star’s life.

The Hunt for Icy Secrets

Intrigued by the nebula’s chemical richness, Charmi Bhatt and her team used JWST’s Mid-Infrared Instrument (MIRI) to study NGC 6302 in unprecedented detail. Specifically, they employed the Medium-Resolution Spectrometer (MRS) mode to examine the central star, the dusty torus, and the inner regions of the nebula’s bipolar lobes.

Mid-infrared observations are crucial for detecting ices, as these molecules absorb infrared light at very specific wavelengths. In this case, the astronomers focused on the 14.8–15.2 micrometer (µm) range, where carbon dioxide ice shows distinctive absorption features.

The team discovered two clear signatures of CO2 ice in the nebula:

  1. A shallow, broad absorption band between 14.9–15.15 µm.

  2. A narrower absorption feature between 15.2–15.3 µm.

These features provided unambiguous evidence of dry ice embedded in the dusty torus of NGC 6302, marking the first-ever detection of an ice species more volatile than water in a planetary nebula.

Why This Discovery Is Surprising

Finding carbon dioxide ice in a planetary nebula is far from expected. While molecular ices are common in cold, shielded environments like dense molecular clouds, envelopes of young stars, and protoplanetary disks, planetary nebulae are usually harsh places for fragile molecules. The intense ultraviolet radiation emitted by the hot central star typically destroys delicate ices before they can survive.

Yet, in NGC 6302, the dusty torus provides just enough shielding to allow CO2 ice to exist. This indicates that certain regions in planetary nebulae can act as icy sanctuaries, preserving molecules that would otherwise be destroyed.

Another intriguing aspect is the difference in the gas-to-ice ratio compared to young stellar objects (YSOs). In NGC 6302, the amount of CO2 ice relative to gas suggests that ice formation and processing in evolved stellar environments may follow unique pathways not seen in younger systems.

Implications for Astrophysics and Astrochemistry

The discovery of dry ice in NGC 6302 has multiple implications for our understanding of planetary nebulae and cosmic chemistry:

  1. Chemical Complexity in Old Stars: It shows that evolved stars can host surprisingly complex chemistry, including ices that were thought to exist only in cold, young stellar environments.

  2. Understanding Stellar Evolution: The presence of CO2 ice can provide clues about the temperature, density, and radiation environment in different regions of the nebula, offering insights into how stars evolve and shed their material.

  3. Clues About the Interstellar Medium: As planetary nebulae disperse their material into the galaxy, these ices might contribute to the chemical composition of the ISM, influencing the building blocks available for future stars and planets.

  4. A Laboratory for Ice Chemistry: NGC 6302 now serves as a natural laboratory for studying how molecular ices form, survive, and process in hostile environments.

The Role of the James Webb Space Telescope

JWST is uniquely suited for this discovery. Its mid-infrared capabilities allow astronomers to see the signatures of molecules that are invisible to most other telescopes. The telescope’s high spatial resolution also enables detailed mapping of the nebula’s structures, distinguishing between the central star, the torus, and the bipolar lobes.

Without JWST, detecting CO2 ice in such a challenging environment would have been extremely difficult. This discovery underscores how JWST is transforming our understanding of stellar death and the chemical processes in the cosmos.

Looking Ahead – What’s Next?

The research team emphasizes the need for further high-resolution studies of planetary nebulae. Key questions remain:

  • Is CO2 ice common in other planetary nebulae, or is NGC 6302 an exceptional case?

  • How exactly does ice survive in environments dominated by strong ultraviolet radiation?

  • What other volatile molecules might exist in the dusty tori of planetary nebulae?

Future observations with JWST and other telescopes could help answer these questions, revealing the hidden chemistry of dying stars and the materials they contribute to the galaxy.

Conclusion

The discovery of dry ice in NGC 6302 is a stunning reminder that the universe still holds many surprises. From beautiful nebular shapes to complex chemical processes, planetary nebulae are not just the remnants of dying stars—they are dynamic chemical laboratories.

As telescopes like JWST continue to explore the cosmos, we can expect more discoveries that challenge our understanding of the universe and the incredible diversity of chemical environments that exist among the stars.

The Butterfly Nebula has now earned a new distinction: the first known planetary nebula to host dry ice, a testament to the marvels of cosmic chemistry and the ingenuity of modern astronomy.

Reference: Charmi Bhatt et al., Detection of CO2 ice in the planetary nebula NGC 6302, arXiv (2026). DOI: 10.48550/arxiv.2602.22366

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