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Interstellar Objects News 2 August 2025 - 13 November 2025

Alien Probe or Cosmic Relic? Interstellar Comet 3I/ATLAS Baffles Scientists (updated 27.10.2025)

3I/ATLAS Today (Nov. 13, 2025): Interstellar comet’s tail keeps growing, ‘radio signal’ confirmed natural, and a different ATLAS comet fragments

Published Thursday, November 13, 2025 Fresh observations today keep 3I/ATLAS—the third confirmed interstellar object—firmly in the “strange but natural comet” camp. Meanwhile, a different ATLAS‑discovered comet in our solar system, C/2025 K1 (ATLAS), is visibly fragmenting. Here’s what changed today, what didn’t, and how to tell these two “ATLAS comets” apart. ScienceAlert+2NASA Science+2 What’s new today (Nov. 13) The science behind the week’s biggest talking points The “radio signal” explained.MeerKAT detected OH absorption at the familiar radio frequencies used to trace water loss in comets. That’s direct evidence that 3I/ATLAS is venting water as it warms—exactly what a coma should
13 November 2025
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Alien Probe or Cosmic Relic? Interstellar Comet 3I/ATLAS Baffles Scientists (updated 27.10.2025)

3I/ATLAS Today (Nov. 11, 2025): Interstellar Comet Reappears with Growing Ion Tail, Morning-Sky Return & Rumor Control

Updated: November 11, 2025 Key points at a glance What’s new today A longer, sharper tail. Astrophysicist Gianluca Masi reports that 3I/ATLAS’s ion tail has lengthened to at least 0.7°, with an anti‑tail also apparent in stacked exposures taken this morning (Nov. 11) from Italy. The session was conducted at low altitude above the eastern horizon under a bright Moon, underscoring just how active and structured the comet has become post‑perihelion. The Virtual Telescope Project 2.0 Visible again before dawn. As predicted, 3I/ATLAS has returned to the morning sky, now drifting through Virgo in the hours before sunrise. BBC Sky
11 November 2025
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Alien Probe or Cosmic Relic? Interstellar Comet 3I/ATLAS Baffles Scientists (updated 27.10.2025)

3I/ATLAS Today (Nov. 7, 2025): New green-glow image, ‘color‑change’ myth debunked, and where to see the interstellar comet now

Updated: Nov. 7, 2025 — This roundup focuses on developments reported today (7.11.2025). Key updates at a glance What scientists reported today Green glow, “hidden” tail—here’s the physics. A new image captured with the Lowell Discovery Telescope shows 3I/ATLAS brightest through a filter sensitive to diatomic carbon (C₂), which fluoresces green in sunlight. The dust tail isn’t gone—you’re seeing it almost head‑on, so it blends with the coma and appears subdued. That geometry explains images where the tail seems to “disappear.” Live Science No, it hasn’t “changed color.” A preprint that compared sun‑skirting observations led to headlines about dramatic hue
8 November 2025
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Rare Interstellar Comet 3I/ATLAS – a 10-Billion-Year-Old Time Capsule – Flies Past Mars

Interstellar Visitor 3I/ATLAS Just Turned Blue and “Accelerated”—Here’s What Really Happened This Week

Key facts (updated Nov 5, 2025): The story so far: what changed in the last few days While 3I/ATLAS was hidden in the Sun’s glare in late October, it slipped into the fields of view of several solar‑monitoring cameras: STEREO‑A (SECCHI), SOHO/LASCO C3 and NOAA’s GOES‑19 CCOR‑1 coronagraph. A new analysis by Qicheng Zhang (Lowell Observatory) and Karl Battams (U.S. Naval Research Lab) reports an extra‑steep brightening as perihelion approached (scaling approximately as r^‑7.5), and color photometry showing the comet was bluer than the Sun, signaling that glowing gas (not just dust) dominated the visible output near perihelion. This is
5 November 2025
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Interstellar Comet 3I/ATLAS: A Visitor from Beyond the Solar System

Ancient Alien Messenger or Cosmic Time Capsule? Interstellar Comet 3I/ATLAS Stuns Scientists with Secrets

Meet the Interstellar Comet 3I/ATLAS – A Visitor From Beyond When astronomers spotted a faint new comet on July 1, 2025, they quickly realized it was no ordinary comet. Its official designation, 3I/ATLAS, tells the tale: “3I” means it’s the third interstellar object ever recorded, and “ATLAS” credits the Asteroid Terrestrial-Impact Last Alert System survey telescope (in Río Hurtado, Chile) that discovered it scientificamerican.com. In the days following discovery, observatories around the world rushed to calculate its orbit – and the results were stunning. Unlike normal comets bound in elliptical orbits around the Sun, 3I/ATLAS was on a one-way hyperbolic
2 November 2025
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Interstellar Comet 3I/ATLAS: A Visitor from Beyond the Solar System

Comet 3I/ATLAS: The Interstellar “Ghost Comet” Haunting Our Solar System This Halloween

What is Comet 3I/ATLAS? An Interstellar Visitor from Beyond Image: Interstellar comet 3I/ATLAS, captured by the Gemini South Observatory in late 2025, showing a diffuse coma and tail against the stars. This “ghostly” haze of gas and dust confirms that 3I/ATLAS is an active comet venting material as it nears the Sun. space.com en.wikipedia.org Comet 3I/ATLAS is a rare celestial visitor that truly doesn’t belong in our solar system. Officially designated 3I/ATLAS (for “3rd Interstellar” object, discovered by the Asteroid Terrestrial-impact Last Alert System), it was first spotted on July 1, 2025 by an ATLAS telescope in Chile esa.int en.wikipedia.org. Within
31 October 2025
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Interstellar Comet 3I/ATLAS: A Visitor from Beyond the Solar System

Interstellar Comet 3I/ATLAS: A Visitor from Beyond the Solar System

3I/ATLAS was first spotted on July 1, 2025 by the ATLAS telescope in Río Hurtado, Chile, and officially designated 3I/2025 A1 (ATLAS), the third confirmed interstellar object after 1I/‘Oumuamua (2017) and 2I/Borisov (2019). It is traveling through the inner solar system at about 60–61 kilometers per second relative to the Sun on a hyperbolic trajectory, with perihelion near the orbit of Mars in late October 2025 (about 1.4 AU). Its closest approach to Earth will be roughly 1.6–1.8 AU (240–270 million kilometers), and it will be behind the Sun from Earth’s perspective at that time, posing no threat. The Hubble
19 August 2025
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3I/ATLAS: The Fastest Interstellar Comet Ever—Here’s What Scientists Are Saying

Interstellar Comet 3I/ATLAS – Third Cosmic Visitor Unveiled, Fast and Enormous

3I/ATLAS is the third interstellar object ever recorded. It was first spotted on July 1, 2025 by the ATLAS survey telescope in Río Hurtado, Chile. The designation 3I/ATLAS marks it as the third interstellar object in our solar system. Its orbit is hyperbolic with an eccentricity of about 6.2, meaning it is unbound and will exit the solar system. A faint coma was observed around 3I/ATLAS within days of discovery, confirming it is a comet. The object was traveling over 60 km/s at discovery and about 68 km/s at perihelion. Perihelion was predicted for October 29–30, 2025 at roughly 1.4
2 August 2025
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