In July 2025, the ATLAS sky survey in Chile spotted a faint comet racing through the solar system at roughly 130,000 miles per hour — and follow-up orbit calculations quickly showed it was not bound to the Sun at all, but had arrived from interstellar spa
A comet older than our solar system is rewriting astronomy’s playbook—here’s what its secrets reveal
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The brief
An interstellar comet, detected in July 2025 by Chile’s ATLAS sky survey, is confirmed as the third known object from outside our solar system. Traveling at 130,000 mph, its trajectory proved it was unbound to the Sun, originating from interstellar space.
Early analysis highlights its deuterium composition and estimated age of 12 billion years, predating the solar system itself. Coverage emphasizes the comet’s scientific significance, with *Smithsonian Magazine* framing it as a rare opportunity to study primordial conditions. *Phys.org* and *Universe Today* focus on its deuterium ratios, suggesting clues about its formation environment. *Space Daily* reiterates its discovery timeline and velocity, underscoring its fleeting visit.
Watch for deeper studies on its composition and origin, as astronomers race to extract data before the comet departs. Follow-up observations may clarify whether it shares traits with previous interstellar objects like ‘Oumuamua or Borisov.
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Quick answers
How fast is this comet moving?
The comet is traveling at approximately 130,000 miles per hour.
Is this the first interstellar comet ever observed?
No—it is the third known interstellar object detected passing through our solar system.
What makes this comet scientifically significant?
Its age (estimated at 12 billion years) and deuterium composition offer insights into conditions in the early universe, predating our solar system’s formation.
Coverage (4)
- Deuterium in Comets Tells Interesting Tales Universe Today · 13h ago
- 12 billion years old, this interstellar comet is older than our solar system Phys.org · 13h ago
- A Rare Comet Made History as the Third Known Interstellar Object to Fly Through Our Solar System. Studies Are Now Revealing the Mysterious Conditions in Which It Formed Smithsonian Magazine · 13h ago
- In July 2025, the ATLAS sky survey in Chile spotted a faint comet racing through the solar system at roughly 130,000 miles per hour — and follow-up orbit calculations quickly showed it was not bound to the Sun at all, but had arrived from interstellar spa Space Daily · 13h ago
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