The relative velocity of stuff that wasn't in the cloud that formed the solar system would almost certainly be really high. So it would take a lot to capture t

The relative velocity of stuff that wasn't in the cloud that formed the solar system would almost certainly be really high. So it would take a lot to capture the an extra-solar body. Any bodies from outside the solar system would probably either travel straight through the solar system or do something like what ʻOumuamua did.