.png)
Celestial Double Feature: The Mystery of Comet Borisov and 3I/ATLAS
- Skywatcher's Hub
- Nov 9, 2025
- 3 min read
Just when we thought 2025 couldn’t get any stranger in the astronomical world, the universe has thrown us a curveball that feels almost too perfectly timed to be a coincidence.
By now, you’re likely obsessively refreshing your feeds for news on 3I/ATLAS, our third confirmed interstellar visitor. We’ve been waiting anxiously as it passed behind the Sun late last month, wondering if it would survive the intense heat or—as some more imaginative theories suggested—engage its "thrusters."
Well, while everyone was looking toward the constellation Virgo waiting for 3I to re-emerge, legendary amateur astronomer Gennady Borisov (yes, the same man who found our second interstellar visitor, 2I/Borisov, back in 2019) spotted something else entirely.
The New Arrival: C/2025 V1 (Borisov)
On November 2, Borisov identified a new object, now officially designated C/2025 V1 (Borisov). Here is where it gets weird: it is currently located almost directly between Earth and 3I/ATLAS in our line of sight.
It’s a cosmic photobomb of epic proportions.
C/2025 V1 is speeding toward a close encounter with Earth on November 11—just three days from now—passing safely at about 0.68 AU (roughly 103 million km).
A Tale of Two Anomalies
The timing and location aren't the only things raising eyebrows. Both of these objects are behaving strangely.
We expect comets to light up as they get close to the Sun, heating up and spewing out glorious tails of gas and dust. Yet, latest reports indicate that neither object currently has a distinct tail.
3I/ATLAS should be roaring with activity after its recently close shave with the Sun, yet it remains a compact point of light. This lack of outgassing is fueling intense debate (and yes, the inevitable "alien probe" headlines).
C/2025 V1 is also surprisingly quiet. While its orbit is highly eccentric (e ≈ 1.009), suggesting it's a visitor from the very distant Oort Cloud, it looks less like a standard comet and more like a dark, icy rock.
Are They Related?
It’s the million-dollar question. Did 3I/ATLAS drop off a probe? Did a larger parent body break apart eons ago, with these two fragments just now catching up to one another?
Harvard’s Avi Loeb has already crunched the numbers. According to his initial analysis, the orbits don’t match up for a recent breakup without some form of non-gravitational propulsion (i.e., something pushing them apart). They haven't been close enough to each other in standard orbital models to be simply fragments drifting together.
It seems we are looking at a magnificent coincidence: a "local" long-period comet from the fringes of our own solar system (V1) arriving at the exact same time, in the same patch of sky, as a visitor from another star entirely (3I).
Why This Matters
For scientists, this is a dream scenario. C/2025 V1 provides a perfect "control group." By observing a native object that is currently in the same region of space and under similar solar conditions as 3I/ATLAS, we can better understand what is truly "alien" about our interstellar guest.
Keep your eyes on the news over the next week. As C/2025 V1 makes its closest approach on the 11th, and 3I/ATLAS continues moving toward its December 19th close approach to Earth, we are in for a month of potentially history-making observations.
Look toward Virgo this week—it's getting crowded out there.
Comments