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Mystery 'alien spacecraft' set to reach Earth today - here's what to expect

A mysterious object, 3I/ATLAS, has captured the attention of the scientific community and the public alike. First identified by NASA’s Asteroid Terrestrial-impact Last Alert System (ATLAS) in July 2025, this interstellar object has displayed some unusual behavior that has led experts, like Harvard scientist Avi Loeb, to speculate that it may not be a naturally occurring comet. Loeb has raised concerns that 3I/ATLAS could be a spacecraft from beyond our solar system, a theory that has ignited a mix of excitement and skepticism.

The object’s trajectory and characteristics are far from typical for a comet. Unlike other comets, 3I/ATLAS is emitting carbon dioxide and water ice, along with carbonyl sulphide, at an unusually high ratio of CO2 to water.

In addition, it displays an “anti-tail,” which points toward the Sun instead of away from it, further perplexing scientists. Loeb suggests that this behavior might indicate that the object is a spacecraft, possibly even a “potentially hostile” one, speeding toward Earth. However, he has not explicitly predicted an alien invasion but remains open to the idea that the object’s true nature could be something entirely unexpected.

The significance of October 29, 2025

Avi Loeb has made headlines by suggesting that October 29, 2025, might be a key date for understanding the true nature of 3I/ATLAS. Speaking to Mayim Bialik, Loeb advised, “If you want to take a vacation, take it before [October 29], because who knows what will happen?” He emphasized that this date could mark a crucial point in the object’s path toward the Sun.


His reasoning revolves around the Oberth effect, a principle in spaceflight that suggests spacecraft burn fuel more efficiently when they are at the highest point in their orbit. Loeb speculates that if 3I/ATLAS is a spacecraft, it could be releasing smaller probes toward planets in our solar system as it reaches its closest point to the Sun. NASA, however, has stated that the object will remain far away from Earth.

Despite Loeb’s warnings, NASA has been more cautious in its assessments. The space agency assures the public that 3I/ATLAS poses no threat to Earth and will pass at a safe distance of about 170 million miles. Its closest approach to the Sun will occur around October 30, 2025, when it will come within 130 million miles, just inside the orbit of Mars. This distance is considered safe, and astronomers continue to monitor the object’s behavior closely.

NASA's findings on 3I/ATLAS

NASA’s research into 3I/ATLAS has confirmed that it is the third interstellar object ever recorded to pass through our solar system. The James Webb Space Telescope has provided crucial data, revealing that the object is emitting various gases, including carbon dioxide and water vapor. These findings suggest that 3I/ATLAS is unlike any comet observed before, both in terms of its composition and behavior.

Although the object’s unusual features have sparked curiosity and conspiracy theories, the International Asteroid Warning Network has listed it as a potential threat due to the challenges its path presents for prediction. However, the scientific consensus remains that 3I/ATLAS is a natural object, possibly even billions of years older than our solar system. While some questions remain unanswered, NASA and other space agencies continue to study it, emphasizing that there is no immediate danger to Earth.

Featured image credit: Fotograzia / Getty

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