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Alpha Centauri is the closest star system to our own, lying around 4.3 light-years away. New research has indicated that, if Alpha Centauri ejects as much material as solar system, then as many as one million space rocks larger than 328 feet (100 meters) wide could be lurking in Oort Cloud, a band of icy material at edge of our solar system. Some of these alien visitors could even make their way into the inner solar system.
The scientists behind new finding suggest that amount of material entering our solar system from Alpha Centauri will increase over next 28,000 years as neighboring star system makes its closest approach to our own.

The closest and nearest solar system is Alpha Centauri. The million alien visitors from another star system could already be lurking in the solar system. We aren't talking about "little green men" here, however — more "little (and not so little) gray rocks," asteroids from the triple star system Alpha Centauri.
https://phys.org/news/2025-04-closest-ne...-torn.html