Interstellar comet 3I/ATLAS continues to make headlines in early 2026 as it makes its dramatic exit from our solar system. Discovered on July 1, 2025 by the ATLAS survey, this object was quickly recognized as only the third confirmed interstellar visitor — after 1I/’Oumuamua and 2I/Borisov — ever observed passing through our solar system.
The comet reached its closest approach to the Sun (perihelion) in late 2025, flying between the orbits of Earth and Mars at a blistering speed of over 150,000 miles per hour. Since then, it has been steadily moving outward, and by spring 2026, it will cross Jupiter’s orbit on its way back into interstellar space.
NASA’s TESS spacecraft conducted a special observation run from January 15-22, 2026, re-examining 3I/ATLAS to gather new data on its rotation rate and activity levels. Additionally, NASA’s SPHEREx mission observed the comet in infrared light in December 2025, revealing how its brightness changed after passing close to the Sun.
ESA’s Hubble Space Telescope performed ultraviolet spectroscopy in November 2025 to analyze the comet’s gas emissions, while the JUICE spacecraft snapped high-resolution images showing 3I/ATLAS’s glowing coma and sweeping tail.
Astronomers confirm that 3I/ATLAS poses absolutely no threat to Earth. Its closest approach to our planet was about 270 million kilometers — far beyond safe distances. Scientists are more interested in what it can tell us: the chemical composition of this interstellar traveler could reveal secrets about planetary formation in distant star systems.
This rare visitor will never return, making every observation a priceless scientific opportunity.