An object believed to have entered the Solar System from interstellar space is drawing intense scientific scrutiny after a Chile-based survey flagged its unusually high speed and hyperbolic path on July 1, 2025.
Detected by the ATLAS (Asteroid Terrestrial-impact Last Alert System) telescope, the body—now designated 3I/ATLAS—was initially noted by an astronomer in Río Hurtado, Chile, when calculations showed an eccentricity well above 1 and a velocity near 58 km/s relative to the Sun, characteristics consistent with an origin beyond our system.
Presenting on July 11 at the UK National Astronomy Meeting, researcher Matthew Hopkins and colleagues traced the object’s motion back through the Milky Way’s thick disk, a stellar population older than that of the Sun’s thin disk, and offered an eye-catching estimate that 3I/ATLAS could be on the order of 10 billion years old. Follow-up observations on July 21 with the Hubble Space Telescope revealed a tear-drop-shaped dust envelope and suggested a nucleus roughly 5 km across. On August 6, a James Webb Space Telescope spectrum indicated CO₂-dominated outgassing—unusual compared with Solar System comets that typically vent water vapor near the Sun—hinting 3I/ATLAS may be largely unprocessed by past stellar heating.
The object’s subsequent behaviour deepened the mystery. Despite strong outgassing—reportedly with a high CO₂-to-water ratio—astronomers did not detect the non-gravitational acceleration commonly seen when jets act like miniature thrusters on comets. Some observers also reported a brief period in early September when the object appeared green in amateur images, even as earlier professional data described it as carbon-chain depleted; independent confirmation of the colour change and its cause remains pending. Claims of radio emissions or structured signals associated with 3I/ATLAS have circulated among amateurs, but NASA has remained silent on any such detections.
On October 3, spacecraft at Mars, including NASA’s Mars Reconnaissance Orbiter and ESA’s Mars Express, were positioned for a close-approach campaign. To date, only a low-detail navigational image from the Perseverance rover has been publicly shown, prompting questions about the timing of higher-resolution releases; agencies have said data are being processed. Astronomers expect 3I/ATLAS to pass behind the Sun around October 30, temporarily obscuring it from ground-based view for roughly three weeks. Observers anticipate renewed monitoring as it re-emerges in December 2025, with additional observations tentatively planned by ESA’s JUICE mission later in the year.
While a few researchers have floated speculative possibilities—including artificial origins—mainstream scientists emphasise that extraordinary claims require independent, peer-reviewed evidence. For now, 3I/ATLAS stands as a rare, likely interstellar visitor whose chemistry and dynamics depart significantly from familiar cometary behaviour, offering a potentially valuable glimpse into the early conditions of other stellar systems. Further data releases and post-perihelion observations are expected to clarify its composition, mass, and trajectory in the weeks ahead.
Nearly 4 weeks has passed since its fly-by of mars and no high res images released.Why? The other images were released within a day or 2.
Seems strange to me, must be frustrating to astronomers eager to see this interstellar comet closer and in much more detail than what has been seen already.
None released from NASA, ESA, Japan or China. No one wants to be the first for some reason, when usually that is the case
That’s because it is all fake just like the moon landing
Don’t look up!!
Without doubt the object is a scientific anomaly.