While comet 3I/ATLAS and its dusty tail remain far out of the reach of Earthly spacecraft, astronomers say the unusual interstellar object has produced a secondary “hidden” trail of charged particles marking its path through our solar system.
Now, a pair of scientists with the European Space Agency (ESA) has proposed a bold idea: it may be possible to sail a pair of NASA and ESA spacecraft through the mysterious visitor’s “ion tail.”
The idea was advanced by a pair of researchers in a new paper, which argues that the trajectory of NASA’s Europa Clipper spacecraft and the European Space Agency’s (ESA) Hera spacecraft could allow them to pass directly through the trail of ions left in 3I/ATLAS’s wake.
Doing so might offer astronomers a rare opportunity to collect samples of material from other worlds, which the odd interstellar comet has ejected during its unprecedented visit.
Mission Into an Interstellar Object’s Odd “Ion Tail”
Between October 30 and November 6, 2025, the trajectories of the Europa Clipper and Hera space missions may briefly align with the ion trail left by 3I/ATLAS, allowing their instruments to collect information through detections of charged particles carried outward from the object by the solar wind.
“During the period 30 October – 6 November 2025, it is predicted that Europa Clipper will potentially be immersed within the ion tail of 3I/ATLAS, providing the opportunity to detect the signatures of an interstellar comet’s ion tail, write authors Samuel Grant and Geraint Jones in their paper, which appeared on the preprint arXiv.org server on October 15, 2025.
“Characteristic changes to the solar wind are also expected to be observed,” the authors say, which will likely include what they characterize as “a magnetic draping structure” potentially emanating from the comet.
Even prior to Europa Clipper’s potential passage through the mysterious ion tail of 3I/ATLAS, Grant and Jones believe that the ESA’s Hera spacecraft “will possibly be immersed within the ion tail of 3I/ATLAS during the period 25 October – 1 November 2025.”
Neither spacecraft will be endangered during their potential transit of the interstellar comet’s tail of charged particles, although the implications of doing so could end up being profound, in that they may offer the first opportunity to make indirect observations of material samples from another star system.
Hellbound and Down 