~~~~~While a strengthless object (rubble pile) would require it to be of a density similar to rocky asteroids a small amount of internal strength similar to icy comets would allow a relatively low density. ʻOumuamua is tumbling, rather than smoothly rotating, and is moving so fast relative to the Sun that there is no chance it originated in the Solar System. It also means that ʻOumuamua cannot be captured into a solar orbit, so it will eventually leave the Solar System and resume traveling through interstellar space. ʻOumuamua's system of origin and the amount of time it has spent traveling amongst the stars are unknown.
https://en.wikipedia.org/wiki/%CA%BBOumuamua
~~~~~Usually, if we get a measurement from a comet that's kind of weird, we go back and measure it again until we understand what we're seeing," said Davide Farnocchia, of the Center for Near Earth Object Studies (CNEOS) at JPL and a coauthor on both papers. "But this one is gone forever; we probably know as much about it as we're ever going to know.
https://solarsystem.nasa.gov/news/759/nasa-learns-more-about-interstellar-visitor-oumuamua
Out there... What if ʻOumuamua is made out of something related to our core unknown effecting it as it went by us? Also could it be the testing to our core going on here doing it?
~~~~~The Earth's core is definitively solid, according to new research by a team of scientists in Australia."
https://www.upi.com/Science_News/2018/10/19/Earths-core-is-definitely-solid-study-finds/6211539953900/?st_rec=6611549336507
What ever is doing it if the Earth's magnetic field has been shifting rapidly heading for Siberia that would be a red flag a pole reversal.
~~~~~Over the last few years, Earth's magnetic field has been shifting rapidly. Most recently, the planet's north magnetic pole began lurching toward Siberia. The sudden and dramatic changes weren't anticipated by WMM's previous update.
https://www.upi.com/Science_News/2019/02/05/NOAA-releases-early-update-for-World-Magnetic-Model/6611549336507/?sl=17
~~~~~Hypothesized triggers
Some scientists, such as Richard A. Muller, think that geomagnetic reversals are not spontaneous processes but rather are triggered by external events that directly disrupt the flow in the Earth's core. Proposals include impact events or internal events such as the arrival of continental slabs carried down into the mantle by the action of plate tectonics at subduction zones or the initiation of new mantle plumes from the core-mantle boundary. Supporters of this hypothesis hold that any of these events could lead to a large scale disruption of the dynamo, effectively turning off the geomagnetic field. Because the magnetic field is stable in either the present North-South orientation or a reversed orientation, they propose that when the field recovers from such a disruption it spontaneously chooses one state or the other, such that half the recoveries become reversals. However, the proposed mechanism does not appear to work in a quantitative model, and the evidence from stratigraphy for a correlation between reversals and impact events is weak. There is no evidence for a reversal connected with the impact event that caused the Cretaceous–Paleogene extinction event.
https://en.wikipedia.org/wiki/Geomagnetic_reversal
