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A lifeless ‘solar’ types constructing blocks of exoplanets in new JWST Butterfly Nebula picture

August 28, 2025
in Astronomy
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A lifeless ‘solar’ types constructing blocks of exoplanets in new JWST Butterfly Nebula picture
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Cosmic mud particles that give start to planets round younger stars have for the primary time been discovered forming — the James Webb Area Telescope has witnessed the creation of those tiny planetary constructing blocks round a lifeless star.

“This discovery is a giant step ahead in understanding how the essential supplies of planets come collectively,” Mikako Matsuura of Cardiff College, who led the brand new James Webb Area Telescope (JWST) observations, mentioned in a statement.

The Butterfly Nebula, often known as NGC 6302 and positioned about 3,400 light-years away in the constellation of Scorpius the Scorpion, is a planetary nebula — the celestial death blossom of a sun-like star that has run out of hydrogen in its core for nuclear fusion and has therefore expired. The outer layers of such a star would have puffed off into space, forming the nebula, while its super-hot core, radiating at 220,000 degrees Celsius (396,000 degrees Fahrenheit), was left behind as what we call a white dwarf.


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The Butterfly is bi-polar, meaning we see two large lobes billowing out like wings. At their waist is what looks like the body of the butterfly, but is in fact a torus of dark dust seen edge-on.

Two glowing "wings" of gas and dust arch outwards from a center point into the darkness of space as part of the Butterfly nebula

A Hubble Space Telescope image of the Butterfly Nebula. (Image credit: NASA/ESA/Hubble SM4 ERO Team.)

The new JWST image, taken with its Mid-Infrared Instrument (MIRI) and supplemented with data from the ALMA radio telescope, targets that central torus. Interstellar dust typically is up to 0.1 microns (ten millionths of a meter) in size, but MIRI detected grains of crystalline silicate dust in the Butterfly Nebula’s torus that has a grain size of a millionth of a meter. This is tiny, but is still larger than typical interstellar grains and rather more comparable with the grains of dust found in star- and planet-forming regions. In such regions, dust sticks together in planet-forming disks around young stars, forming pebbles that gradually accrete into larger bodies and, eventually, planets. The existence of large dust grains is the beginning of that planet-building process.

Dust found in the molecular gas clouds that form new star systems comes from the deaths of previous generations of stars, and as that dust gradually spills out into interstellar space, it finds itself within the gas clouds that form new stars. However, the process of building larger dust grains that are ultimately the fundamental building blocks of planets had been somewhat mysterious — until now, that is.

“For years, scientists have debated how cosmic dust forms in space,” said Matsuura. “But now, with the help of the powerful James Webb Space Telescope, we may finally have a clearer picture.”

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The size of the dust grains in the Butterfly Nebula suggests that they have been growing for a while, and they have grown at least in part thanks to chemical reactions energized by the exceedingly hot white dwarf at the center of the nebula. In particular, the JWST detected grains of quartz crystals in the Butterfly’s dusty torus.

“We were able to see both cool gemstones formed in calm, long-lasting zones and fiery grime created in violent, fast-moving parts of space, all within a single object,” said Matsuura.

A labeled image of the Butterfly nebula, showing the torus, inner and outer bubbles, and dust.

An annotated version of the JWST’s image of the Butterfly Nebula. (Image credit: ESA/Webb/NASA & CSA/M. Matsuura/ALMA (ESO/NAOJ/NRAO)/ N. Hirano and M. Zamani (ESA/Webb).)

The JWST observations also detected common carbon-based molecules known as PAHs, or polycyclic aromatic hydrocarbons. These molecules are found on Earth in burnt toast and fumes from car exhausts, but they are also profusely present in deep space and are suspected of playing a key role in the chemistry of star- and planet-forming regions, and even in the prebiotic chemistry that can potentially lead to life as we know it. The PAHS exist in the Butterfly Nebula in flat ring-like structures possibly formed when bubbles of particles belched out by the white dwarf clash with the gas around it.

Over tens of thousands of years, the brilliance of the Butterfly Nebula will gradually disperse into deep space. The PAHs, quartz grains and other molecules formed from the death of a star will drift among the stars, looking for a new home in a gas cloud where it can help give birth to a new system of stars and planets.

The results of the JWST observations of the Butterfly Nebula were reported on Aug. 27 in the journal Monthly Notices of the Royal Astronomical Society.



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