According to scientists, most interstellar objects that approach the vicinity of Earth tend to come from the direction of the constellation Hercules. It is believed that such bodies periodically fall to our planet, but recording these events is extremely rare. Calculations show that these falls most often occur during winter and near the equator.

On January 8, 2014, satellites of the US Department of Defense detected the explosion of an object about a meter in size in the atmosphere above Papua New Guinea. This object was cataloged as CNEOS 2014-01-08, and its fragments likely fell into the Pacific Ocean.

Interest in this event arose several years later, after the discovery of the first interstellar object, 'Oumuamua, in the Solar System. One of the signs of the extraterrestrial origin of CNEOS 2014-01-08 was its high speed, similar to the characteristics of 'Oumuamua.

In 2022, an expedition was organized to the impact site, during which metallic spherules with an unusual chemical composition were recovered from the ocean floor. The connection between these findings and the CNEOS 2014-01-08 object, as well as its interstellar origin, remains the subject of scientific debate.

Characteristics of Interstellar Objects

An international team of astrophysicists calculated that the object had typical features of interstellar bodies that fall to Earth. These findings were published in a recent article on the preprint server arXiv.org.

In their calculations, the scientists assumed that most stars in the Milky Way are red dwarfs, and that interstellar objects are most often ejected from such systems, sharing similar motion parameters.

Where Interstellar Bodies Come From

The researchers focused on determining the directions from which interstellar objects arrive and the regions where they are most likely to fall to Earth. Although these bodies can move in various directions, the movement of the Solar System itself also affects their trajectories.

The Sun, along with the planets, moves through the Milky Way toward the constellation Hercules. This creates a kind of "headwind" of interstellar matter, which is why most interstellar objects approach from the direction of this constellation.

Since the constellation Hercules is located in the northern sky, it might be expected that objects would fall more often in the Northern Hemisphere. However, the most likely region for impacts is considered to be the equator and its surroundings, as Earth's rotation increases the probability of collisions in this area.

The Influence of Seasons and Trajectories

The Earth's annual movement around the Sun also affects the likelihood of impacts: in autumn and winter in the Northern Hemisphere, the planet moves away from the constellation Hercules, while in spring it moves toward the stream of interstellar objects, increasing the speed of collisions. During the colder months, the Sun's gravity more effectively captures such objects and directs them toward Earth.

For an interstellar object to fall to Earth, it must move close to the plane of the planets' orbits, and preferably in a retrograde direction—opposite to the movement of the planets. For example, the interstellar comet 3I/ATLAS follows such a trajectory.