>>513117068
an interstellar rock that just so happens to be almost perpendicular with our solar system's eliptic, and just so happens to be passing very close to several planets in the inner system, and just so happens to be very large considering large objects shouldn't really exist in interstellar space, and just so happens to be at perihelion behind the sun from our perspective which is the best time to make a maneuver to stay in our system when we can't observe it.
just a rock tho.