Scientists Think Visitors From Another Star System May Have Infiltrated Our Galactic Neighborhood
- The Alpha Centauri star system is the closest to our Solar System, and it's possible that particles from it are currently making their way into our neighborhood of stars, or may have already arrived.
- To get an idea of what to expect, researchers used existing models to forecast how many particles of various sizes that may already exist in our Solar System and are possibly coming in from Alpha Centauri each year.
- Investigating the ejection and transfer of particles from Alpha Centauri could provide us with a better understanding of how material is exchanged between star systems.
What kind of system are you referring to? Is it a system in a nearby star system, or one that's far away in a distant galaxy?
It would be extremely difficult for any spacecraft to reach or for any telescope to observe. However, that doesn't mean we have no interstellar objects available to study—we actually have many particles from another star system that are already here.
It's currently approaching our Solar System at a speed of 49,709 miles per hour, and should be at its closest point in about 27,700 years. Taking this into account, researchers Cole Gregg and Paul Wiegert from the University of Western Ontario wanted to determine how many objects from Alpha Centauri might have already arrived here, and how many could potentially reach us in the future.
It's expected to increase as Alpha Centauri gets closer.
Noting the gravitational pull of more stars and planets, it's likely that material will scatter, which could result in planets orbiting this three-star system, though none have been confirmed yet.
Every year, there could be as many as a million objects with diameters of over 100 meters from the system existing in our Oort cloud (with many smaller objects and particles also present among them).
may be able to hold on long enough to get out there and scan for signs of something from Alpha Centauri.
They slow down greatly because of drag in the interstellar medium, or get severely damaged by extremely fast-moving gas atoms or by colliding with each other.
The system's gravity will greatly increase the speed of the objects. Even more particles could come from hypothetical comets—at least, they could if Alpha Centauri ejects as many as our Solar System does—but these are unlikely to be observed. Whether these potential particles are actually detectable remains to be seen.
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