NASA’s Hubble Space Telescope has captured the most detailed images yet of 3I/ATLAS, a rare interstellar comet traveling through our solar system at over 130,000 miles per hour (210,000 kilometers per hour). The observations, made last month, when the comet was approximately 277 million miles (445 million kilometers) from Earth, reveal a teardrop-shaped cloud of dust streaming from its icy nucleus.
The latest data offers new insights into the comet’s size and characteristics as it approaches the Sun for a close pass in late October, during which it will remain on the far side of the star from Earth. 3I/ATLAS, first detected on July 1 by the Asteroid Terrestrial-impact Last Alert System (ATLAS) in Chile, is only the third interstellar object ever observed passing through our solar system, following ‘Oumuamua in 2017 and 2I/Borisov in 2019.
The discovery was confirmed the next day after follow-up observations indicated the object’s high velocity and trajectory could only be explained by an origin outside the solar system. Scientists estimate the comet has been traveling through interstellar space for billions of years, gaining speed from gravitational encounters with stars and stellar nurseries. The new Hubble images suggest that the comet’s nucleus is much smaller than initially estimated.
Debate heats up: could 3I/ATLAS be alien tech?
Early measurements from the Vera C. Rubin Observatory indicated a possible diameter of about 7 miles (11.2 kilometers). However, Hubble’s precision now places its likely maximum size at 3.5 miles (5.6 kilometers) across, with a minimum estimate of about 1,000 feet (305 meters). Despite its relatively modest dimensions, this still makes 3I/ATLAS the largest interstellar object ever detected. Scientists caution that its exact composition remains unknown, though its behavior closely resembles that of comets native to our solar system.
David Jewitt, an astronomer at the University of California, Los Angeles, and leader of the Hubble science team, likened tracing the comet’s origin to glimpsing a rifle bullet for a fraction of a second and attempting to reconstruct its entire path. The uncertainty surrounding its starting point underscores the rarity and scientific value of interstellar visitors, which may pass through the solar system far more often than they are detected.
Alien-probe theory sparks public fascination and controversy
Additional observations are planned in the coming months using NASA’s James Webb Space Telescope, the Transiting Exoplanet Survey Satellite, and the Neil Gehrels Swift Observatory. These instruments, along with ground-based facilities such as the W.M. Keck Observatory, will help determine the comet’s chemical composition and refine estimates of its size. The comet is expected to remain visible to ground-based telescopes through September before passing too close to the Sun to be observed, reappearing in early December. Some researchers are pursuing unconventional theories.
Harvard astrophysicist Avi Loeb, known for his controversial views on extraterrestrial technology, has speculated that 3I/ATLAS could be an artificial object. While most astronomers reject this idea and consider it a natural comet, Loeb’s comments have fueled public interest in the object’s true nature. The discovery of 3I/ATLAS coincides with the operational debut of the Vera C. Rubin Observatory, which is expected to detect more interstellar objects in the coming decade.
Astronomers believe such discoveries will help them better understand the diversity, composition, and origins of these rare cosmic visitors. As Jewitt noted, advances in sky-survey capabilities have opened a new era in detecting and studying interstellar travelers, making sightings like 3I/ATLAS increasingly possible. – By Content Syndication Services.