Rusty Heart of an Interstellar Comet Makes It Shine ⚡ экспресс
3I/ATLAS is the second known interstellar object to visit our Solar System. Spectral analysis shows it resembles primitive carbonaceous chondrites (stony meteorites), but with a higher metal content. As it approached the Sun, ice melted and reacted with metal particles, kicking off the synthesis of organic molecules around the nucleus — like a natural chemical mini-reactor. These processes explain the unusual composition of its tail, which you wouldn't expect from a Solar System comet, because most of them don't inherit this much metal.
The second interstellar guest, comet 3I/ATLAS, shines unusually due to rusting metal grains in its icy core. As it gets closer to the Sun, it behaves like an old tin can tossed into a fire: the heat melts the ice, water seeps into the metal, and vigorous corrosion begins. In its depths lies water ice, carbonaceous compounds, and metallic dust — a legacy of distant stars.
Corrosion kicks off a chemical conveyor belt: simple gases give birth to complex hydrocarbons. This "rusty soup" makes the glowing envelope unusual. As it heats up, the comet erupts with icy geysers, spewing this mixture into space. Using spectroscopy (breaking light into colors) and photometry (measuring brightness), astronomers determined that the comet's chemical fingerprint matches the composition of ancient meteorites found in Antarctic ice.
Interstellar wanderers are rare. They offer a glimpse into the past: similar icy bodies lurk beyond Neptune and in the Oort cloud. Cosmic dust, from which all this was born, is still full of chemical mysteries.
🎯 3I/ATLAS is only the second confirmed interstellar object after ʻOumuamua, spotted in 2017.