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@Justwanttoknowmore I reccomend that you read this research paper: researchgate.net/publication/282980645_Asteroid_Mining to learn more. As for your question, one of the technologies that I know that are being worked on is In-Situ Resource Utilization.
@PM2Ring yes you are correct about that. Binary star systems like the infamous Kepler-47 are common but we have not yet observed a scenario where a single star successfully catches solar systems in it's orbit.
