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Moreover, if it was cometary activity, then we would expect the spin period of this object to change, and we don’t see that.All of these things are indicative of the fact that it is nothing like a comet that we have seen before in the solar system. Its brightness varies by a factor of ten, and the maximum you typically observe is a factor of three.The only thing that came to my mind is that maybe the light from the sun, as it bounces off its surface, gives it an extra push.
If you roll the dice so many times, and there are tens of billions of stars in the Milky Way, it is quite likely we are not alone.
So this civilization would be out of the solar system and in the galaxy? It may be dead by now, because we don’t take good care of our planet.
Your explanation of why ‘Oumuamua might be an interstellar probe may be hard for laypeople to understand.
Why might this be the case, beyond the fact that lots of things are possible?
October 19, 2017, astronomers at the University of Hawaii spotted a strange object travelling through our solar system, which they later described as “a red and extremely elongated asteroid.” It was the first interstellar object to be detected within our solar system; the scientists named it ‘Oumuamua, the Hawaiian word for a scout or messenger.
The following October, Avi Loeb, the chair of Harvard’s astronomy department, co-wrote a paper (with a Harvard postdoctoral fellow, Shmuel Bialy) that examined ‘Oumuamua’s “peculiar acceleration” and suggested that the object “may be a fully operational probe sent to Earth’s vicinity by an alien civilization.” Loeb has long been interested in the search for extraterrestrial life, and he recently made further headlines by suggesting that we might communicate with the civilization that sent the probe.
If this object came from another star, that star would have to be very special. When it was discovered, we realized it spins every eight hours, and its brightness changed by at least a factor of ten.
The fact that its brightness varies by a factor of ten as it spins means that it is at least ten times longer than it is wide.
So we checked that and found that you need the thickness of the object to be less than a millimetre in order for that to work.
If it is indeed less than a millimetre thick, if it is pushed by the sunlight, then it is maybe a light sail, and I could not think of any natural process that would make a light sail.