Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?
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Notes -
If the objects showing up are aliens, they are certainly not using conventional fusion drives. We would notice the gigantic plumes of plasma from the other side of the solar system. Most reports seem to agree on anomalous propulsion, extremely sudden and violent acceleration. That could just be an optical illusion or error of course.
Alien technology is probably overwhelmingly beyond us, such that we don't understand the principles involved. Maybe once we have stellar-scale particle accelerators and planetary scale computers, a theory of everything, understand dark matter/energy and the origin of the universe, then we can be confident of these things.
Obviously a star decelerating into our solar system would’ve been immediately noticeable since at least the late 19th century, but solar sails or their magnetic equivalent could also be used to decelerate, and this is probably much less noticeable.
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