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originally posted by: Phage
a reply to: peacefulpete
Incorrect. There are strong indications.
I don’t think there’s any indication that it’s spinning.
Scientists conclude that interstellar object 'Oumuamua must be very elongated because of its dramatic variations in brightness as it tumbled through space. They also conclude that vents on the surface must have emitted jets of gases, giving the object a slight boost in speed, which researchers detected by measuring the position of the object as it passed by in 2017.
Marco Micheli of ESA’s (European Space Agency) Space Situational Awareness Near-Earth Object Coordination Centre in Italy said: “Our high-precision measurements of ′Oumuamua’s position revealed that there was something affecting its motion other than the gravitational forces of the Sun and planets.”
The object flew by Earth so fast its speed couldn't be due to the influence of the Sun's gravity alone, so it must have approached the solar system at an already high speed and not interacted with any other planets. On its journey past our star, the object came within a quarter of the distance between the Sun and Earth.
What does it look like? All that astronomers have seen of 'Oumuamua is a single point of light. But because of its trajectory and small-scale accelerations, it must be smaller than typical objects from the Oort Cloud...
Based on the interesting but highly unlikely suggestion that 'Oumuamua is an interstellar spacecraft, due to some unusual orbital and morphological characteristics, we examine our data for signals that might indicate the presence of intelligent life associated with 'Oumuamua. We searched our radio data for: 1) impulsive narrow-band signals; 2) persistent narrow-band signals; and 3) impulsive broadband signals. We found no such signals with non-terrestrial origins and make estimates of the upper limits on Equivalent Isotropic Radiated Power (EIRP) for these three cases of approximately 7 kW, 840 W, and 100 kW, respectively. These transmitter powers are well within the capabilities of human technologies, and are therefore plausible for alien civilizations. While the chances of positive detection in any given Search for Extraterrestrial Intelligence (SETI) experiment are vanishingly small, the characteristics of new generation telescopes such as the MWA (and in the future, the Square Kilometre Array) make certain classes of SETI experiment easy...
She does not say it was "speeding up."
She explained that the comet is indeed speeding up, not just accelerating.
"The surprising observation we discovered was that 'Oumuamua was accelerating," says Meech. "In other words, it wasn't just influenced by the gravity of the planets and the Sun, it was actually moving faster than it should have on its outbound journey."
No. If it were doing so, the astronomers would be a hell of a lot more excited about it than they already are. `Oumuamua displayed non-gravitational acceleration, like other comets have.
actually picking up speed as it leaves our solar system
The motion of all celestial bodies is governed mostly by gravity, but the trajectories of comets can also be affected by non-gravitational forces due to cometary outgassing
And yet, the more we learn about other star systems, it seems the odder they can be.
There is the mediocrity principle, which would hold that our solar system is likely to be largely typical of most others.
There isn't much chance we will learn more than we have about it. Other than it's been on a very long journey and we happened be be able to say, "Oh. Hello."
agree, it's premature to say what Oumuamua isn't.
A BIZARRE “cigar-shaped” interstellar object hurtling through space is picking up speed, baffling scientists.
Karen said: “The more we study Oumuamua, the more exciting it gets. “I’m amazed at how much we have learned from a short, intense observing campaign. I can hardly wait for the next interstellar object.” Oumuamua is now farther away from our Sun than Jupiter and travelling away from the Sun at about 70,000mph as it heads toward the outskirts of the solar system. In only another four years, it will pass Neptune's orbit on its way back into interstellar space.
`Oumuamua -- the first interstellar object discovered within our Solar System -- has been the subject of intense scrutiny since its discovery in October 2017. Now, by combining data from the ESO's Very Large Telescope and other observatories, an international team of astronomers has found that the object is moving faster than predicted. The measured gain in speed is tiny and `Oumuamua is still slowing down because of the pull of the Sun -- just not as fast as predicted by celestial mechanics.