At first glance, 3I/ATLAS is a strange visitor: it is only the third interstellar object detected in our system and it is following a fast and highly inclined path with respect to the ecliptic. After passing behind the Sun, it begins to be observable again with large telescopes and, in the coming weeks, with increasingly diverse instrumentation. It is a valuable time to measure its brightness, color and activity (gas and dust), and to pinpoint its orbit in greater detail.
From the orbital point of view, the key data is already set. It reached perihelion between October 29 and 30, 2025 at 210 million km from the Sun and Its closest approach to Earth will be on December 19, 2025. to 270 million km. It does not represent any danger to our planet, in fact, its approach occurs on the other side of the Sun and always at great distances.
Why Hawking’s “warning” returns
Every time an interstellar visitor makes headlines, Stephen Hawking’s cautions return, who warned in 2010 that eventual contact with an advanced civilization could recall the encounter between Columbus and the native peoples of America, “It didn’t end well for the natives.” His position was clear: It is advisable to avoid attracting the attention of possible more advanced civilizations. That idea is cited today to contextualize speculation around “unnatural” signals, although the community maintains its focus on observational evidence.
3I/ATLAS: what it is and where it is now
3I/ATLAS is a comet from outside the solar system, detected in July 2025 by the ATLAS program. Its perihelion occurred 210 million km from the Sun. After that pass, it began to be captured again (there are already recent optical images from professional observatories) and it will gain height above the horizon in the coming weeks, facilitating studies of composition and activity. It will not approach Earth beyond 1.8 AU in December.
And the “technological” hypothesis?
Astrophysicist Avi Loeb has publicly suggested that some features of 3I/ATLAS deserve to be examined as possible anomalies. and, therefore, do not rule out an artificial origin from the start. It has published lists of “indications” and even its own scale of “technological risk”, which has generated controversy and media coverage. The institutional position (NASA/ESA) remains that 3I/ATLAS is a natural comet and a scientific opportunity to improve models and tracking techniques; in no case is it considered a threat.
Who was Stephen Hawking?
Stephen Hawking (1942–2018) was a British theoretical physicist and popularizer, famous for his work on black holes and cosmology (Hawking radiation) and for bringing physics to the general public. with books like A Brief History of Time. In 2010, in a documentary series, he expressed his caution regarding possible contact with extraterrestrial civilizations, comparing it to historical episodes of unequal encounters between human civilizations. His comments resonate today as a framework of caution, but they do not replace the scientific method or the observations being made on 3I/ATLAS.