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Interstellar Visitor with Carbonated Breath ⚡ экспресс

Original: "SPHEREx Discovery of Strong Water Ice Absorption and an Extended Carbon Dioxide Coma in 3I/ATLAS"
arXiv:2508.15469 · 2025-08-21 · CC BY 4.0 · ⏱ 1 min · Exoplanets Galaxies Stellar General Relativity
An object from another star system releases carbon dioxide like an open soda bottle, hiding its core in a cloud of dust.
Abstract

Scientists examined the interstellar object 3I ATLAS and saw that its bright cloud of dust and gas hides a tiny nucleus — like a dense fog concealing a lantern. It seems such visitors from other star systems are much smaller than they appear. I wonder how many more of these wanderers we’ll be able to spot?

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The interstellar object 3I ATLAS is like an opened bottle of soda: it continuously releases carbon dioxide, wrapping itself in a thick cloud. The SPHEREx telescope split its light into a rainbow — a method called spectroscopy — and spotted the telltale signs of gas and water ice, which absorbs some of the light like tinted glass.

The cloud turned out to be perfectly round, without tails or jets. Precise brightness measurements showed that the gas is so abundant it completely hides the nucleus. Over 99% of the light comes from cosmic dust, not from the body itself. The actual nucleus — a solid chunk no larger than three kilometers across — is lost inside this shimmering shell, like a pea in a cloud of steam. Amazingly, this is only the third such wanderer spotted by humanity.

🎯 This object is only the third known interstellar visitor after ‘Oumuamua and Comet Borisov.

🎬 The storyline echoes Arthur C. Clarke's 'Rendezvous with Rama': a mysterious object from interstellar space that challenges science.

Scientists
Christian DopplerD. B. McLaughlinDidier QuelozMichel MayorR. A. RossiterJames Clerk Maxwell
Tags
spectroscopy photometry Water carbon cosmic dust
Laws
Doppler effectMaxwell's equationsPlanck's lawPlanck–Einstein relationWien's displacement lawStefan–Boltzmann law
Original: arXiv:2508.15469 · CC BY 4.0 · bridge42worlds