Archive · 28 Oct 2025
3I/ATLAS's Unusual Behavior Sparks Debate Before Sun Approach
A strange object named 3I/ATLAS, from outside our solar system, is getting closer to the Sun.
On October 29, it will be closest, passing near Mars' orbit.
Unlike normal comets, 3I/ATLAS acts weirdly.
It initially had a tail pointing towards the Sun, then the tail flipped direction.
It also has a chemical called nickel tetracarbonyl, never seen in natural comets.
These oddities have some scientists wondering if it might be something other than a natural space rock, like maybe even a spacecraft.
Scientists are watching closely to figure it out.
Interstellar object 3I/ATLAS will reach its closest point to the Sun on October 29.
The comet exhibits unusual behavior, including an anti-solar tail and the detection of nickel tetracarbonyl.
Early observations showed an anti-solar tail, with gas ejecting toward the Sun.
Spectral analysis detected nickel tetracarbonyl, a compound never before seen in natural comets.
Harvard astrophysicist Avi Loeb suggests 3I/ATLAS might be an alien spacecraft.
- Who
- Interstellar object 3I/ATLAS
- What
- Will reach its closest point to the Sun
- When
- October 29
- Where
- Near the Sun
- Why
- To study its composition and behavior
Scientific Community
Avi Loeb
Object Nature
Scientific Community
3I/ATLAS is a natural object with unusual cometary behavior.
Avi Loeb
3I/ATLAS could be an alien spacecraft, based on observed anomalies.
- Object Name
- 3I/ATLAS
- Perihelion Date
- October 29
- Distance at Perihelion
- 1.36 AU
- Origin
- Beyond Solar System
- Notable Behavior
- Anti-solar tail, tail reversal, nickel tetracarbonyl detection
Sources
Interstellar Comet 3I/ATLAS to make closest approach to Sun this week: Could it be a Black Swan event? 13 things to know
Intersteller spectacle: Fiery encounter looms as 3I/ATLAS races toward Sun’s far side
Why October 29 Is Key To Solving The Mystery Of Comet 3I/ATLAS
