In recent years, the appearance of interstellar objects like 3I/ATLAS has served as another reminder to astronomers of how easily unique opportunities to gain new knowledge about the Universe can be missed. No one can predict what information this visitor from the depths of space might bring, and most likely, we will not have the chance to observe it up close. To avoid similar disappointments in the future, scientists suggest preparing in advance for the next encounter with an interstellar object—by creating a special probe and keeping it on standby.

Missed Opportunities: Lessons from Recent Years

After the discovery of the mysterious object ‘Oumuamua (1I/’Oumuamua) in 2017, which unexpectedly accelerated as it moved away from Earth, many researchers considered it a mistake to simply let it fly by without attempting a closer study. In response, the international Initiative for Interstellar Studies developed the “Lyra” project, which envisioned sending a probe in pursuit of the interstellar object. Astronomers even calculated an optimal trajectory using a gravity assist from Jupiter, which would allow the probe to reach ‘Oumuamua in 26 years and capture real images of it. However, the project proved too complex, expensive, and required urgent action, so it could not be realized.

Two years later, when the Borisov comet (2I/Borisov) entered the Solar System, the idea of sending a probe was revived. But again, there was not enough time to design, test, and launch a spacecraft—the comet quickly moved beyond reach.

A New Approach to Studying Interstellar Visitors

Currently, the object 3I/ATLAS is traveling through the Solar System. This time, astronomers have proposed an alternative approach: redirecting one or more existing interplanetary spacecraft to study it. However, so far, neither NASA nor other space agencies have responded to this call, and for some proposed missions, the window of opportunity has already closed.

This situation has caused concern in the scientific community and is prompting the search for new solutions. Recently, researchers from the Southwest Research Institute (USA) concluded that it is practically impossible to respond quickly enough to the appearance of an interstellar object. The only viable solution is to build a special spacecraft in advance, ready for launch as soon as a new visitor is detected.

Prospects for Future Missions

Scientists have considered various trajectory options for a probe, depending on the movement of the object itself. The most effective solution appears to be a high-speed intercept with the interstellar body. According to calculations, flying to such an object could even be simpler than many other interplanetary missions, and with a ready-to-launch probe, it would be quite feasible to reach a comet like 3I/ATLAS.

Researchers note that about 10,000 interstellar objects enter the orbit of Neptune each year. This means we won’t have to wait long for the next opportunity to study them—the key is to be prepared in advance.