Alien Comet Siege: Why Earth Was Never Surrounded | Unexplained

UFO & Aliens

Alien Comet Siege: Why Earth Was Never Surrounded

Comets C/2020 F8 (SWAN), C/2019 Y4 (ATLAS), and interstellar comet 3I/ATLAS all followed natural, well-understood orbits; none came closer than tens of millions of kilometers to Earth, and none were on a collision…

November 25, 2025 • 5 min read • Art Grindstone

Art Grindstone is the hard-nosed storyteller behind Unexplained.co, a veteran investigator whose life’s work sits at the crossroads of the paranormal, fringe science, and the shadows most people try not to look into. With decades spent chasing impossible stories — black-budget psychic programs, vanished Cold War experiments, desert rituals that sparked UFO waves, and the strange phenomena buried in America’s forgotten backroads — Art brings a rare combination of skepticism, awe, and journalistic precision. He’s not here to debunk. He’s not here to blindly believe. He follows the evidence wherever it leads — even when it leads someplace deeply uncomfortable. Known for his immersive, cinematic style and his ability to turn obscure research into gripping narrative, Art has built a devoted following across podcasts, long-form features, documentaries, and serialized investigations. His interviews are direct. His analysis is unflinching. His voice has become a staple in the modern paranormal renaissance — the guy people turn to when a story is too strange, too complex, or too dangerous for anyone else to touch. Off-mic, Art works with a distributed network of researchers, archivists, and field operatives who help surface the stories mainstream media ignores. On-mic, he transforms their findings into meticulous, high-impact reporting that refuses to insult the intelligence of true believers. His philosophy is simple: Take the phenomenon seriously. Treat the audience with respect. Tell the story as if the world depends on it — because sometimes it does. When Art Grindstone digs into a case, he isn’t just chasing a mystery. He’s tracing the fault lines of reality itself.

In This Report(5)

Comets C/2020 F8 (SWAN), C/2019 Y4 (ATLAS), and interstellar comet 3I/ATLAS all followed natural, well-understood orbits; none came closer than tens of millions of kilometers to Earth, and none were on a collision course.
The ‘sunward tails’ or anti-tails seen on SWAN and ATLAS are normal effects of solar wind and dust geometry, not evidence of engines, steering, or ‘strategic positioning’ around our planet.
NASA and independent astronomers have imaged 3I/ATLAS in detail and confirmed it is a typical, dusty, icy comet—no alien hardware, no secret threat—while misinformation online repackages ordinary comet behavior as something sinister.

The Hook: When a Green Comet Looks Back at You

Picture this. A glowing green streak cuts across the night sky, its tail twisting like it’s staring right back. Viral images flood your feed, whispers of comets "approaching Earth" or "flanking" our spot in the cosmos. Is it watching us? In 2020, with the world locked down by a pandemic, eyes turned upward. People trapped indoors devoured every scrap of sky news. Comets C/2020 F8 (SWAN) and C/2019 Y4 (ATLAS) became obsessions, their dramatic glows fueling endless online chatter.

Fast forward to 2025. An interstellar wanderer, 3I/ATLAS, bursts onto the scene. Old fears ignite anew. Social media erupts with alien probe theories. Why now? Why these comets? If two bright visitors show up in 2020, and a third from beyond our system years later, it starts to feel like a trap closing in. Tails pointing the wrong way. Paths that seem too perfect. The numbers say it’s nothing. But that cosmic pinch? It hits hard in these anxious times.

Why Do Some People Think Comets Are ‘Strategically Surrounding’ Earth?

We’ve all seen the posts. They spread like wildfire. Comets SWAN (C/2020 F8), ATLAS (C/2019 Y4), and the interstellar 3I/ATLAS aren’t random ice balls. No, they’re alien probes. Or worse, weapons. Coordinated. Their "sunward tails" hide engines, steering them into position. That’s the claim echoing through forums and videos.

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It starts in 2020. Two comets slice through the inner Solar System. Then, in 2025, this outsider from another star joins the party. Conspiracy threads paint it as a deliberate siege. Earth triangulated. Surrounded. Orbital diagrams get twisted—flat 2D maps make it look like these things are parking around our path, holding formation.

A Reddit user nails it: these ideas get turbocharged by high-profile skeptics like Avi Loeb, who stir the pot on alien tech. Suddenly, every comet is a scout. And those NASA image delays for 3I/ATLAS? Not just bureaucracy. A cover-up, they say. Hiding the truth while the probes close in. It sounds wild. But in the echo chambers, it makes sense. People connect dots that aren’t there. Question everything. That’s the draw.

Comet	Minimum Distance to Earth (AU)	Potentially Hazardous Threshold (AU)	Status
C/2020 F8 (SWAN)	0.56	<0.05	Well outside danger zone
C/2019 Y4 (ATLAS)	0.78	<0.05	Well outside danger zone
3I/ATLAS	>1	<0.05	Well outside danger zone