From October 1 to November 9, 2025, Comet 3I/ATLAS (also known as C/2025 N1) will become unobservable from Earth due to solar conjunction — making it too close to the Sun’s glare for ground-based telescopes. Thus it will be unobservable when it reaches its perihelion (point on its trajectory closes to the Sun) on October 29, 2025. It should reappear for observations in early November 2025, though visibility will be limited to equatorial regions initially.
As previously mentioned in these updates, the comet may not even be a comet since it is so weird. And it is so weird that Harvard astrophysicist Avi Loeb has had a field day on newscasts and podcasts speculating on the possibility that the object may be artificial in origin. YouTube is filled with both rational discussion and outrageous hype about this extremely odd interstellar mass, with talk of alien machinery, etc. And is it worth noting that the object will be invisible to us on Halloween day? (See illustration, above, for a chuckle.)
While 3I/ATLAS is in a sense a UFO — we do not yet understand why it is so odd, why it is so different from the previous two interstellar interlopers to our solar system as well as from all other comets, a category it has sort of been shotgunned into by most respectable observers — it is one whose outré status may be falsified in the next few months. If it does not slow down or speed up after its “dark” (eclipsed) period behind the Sun, we can probably determine it’s not “too” outré.
But something interesting is happening right before disappearing: it’s been hit with a coronal mass ejection (CME):
What are the odds? Already the odds of an interstellar object of this size should “do” a flyby of three planets (Mars, Venus & Jupiter) in the plane of the ecliptic boggles the mind. Add all the rest, and now this CME, and what do we get? A riddle orbiting a mystery recolving around an enigma!
This is all not just entertaining science stuff. Understanding objects flying within the orbits of the terrestrial planets has to be regarded as a safety issue for all people on our planet.