Discussion in 'science, nature and environment' started by 2hats, Oct 27, 2017.
I read the ice here was sub-surface so no significant coma would form.
Luckily their timeframes are in the billions of years. In 560,000,000 AD they will come and smash us.
'Oumuamua got closer to the Sun that Mercury does. Even if the ice was covered by a surface layer, I'd have thought getting that close would still produce enough heat to melt it.
A newly published photometric study (doi:10.1038/s41550-018-0398-z) indicates that Oumuamua is tumbling chaotically which would suggest that it has suffered an impact (quite possibly around the time it left its parent system). This tumbling motion will take something on the scale of a billion years to damp out (spin stress/strain tidal braking).
More interesting stuff learned about 'Oumuamua
First Known Interstellar Object Gets Unexpected Speed Boost
The mystery deepens -
Interstellar Comet ’Oumuamua Might Not Actually Be a Comet | Quanta Magazine
A new Harvard paper entertains the idea that 'Oumuamua could be an alien lightsail.
So we have an elongated object arriving from out of the ecliptic that appears to accelerate on leaving the solar system but with no apparent outgassing (no spin up). Not the behaviour of a comet or an asteroid, the non-gravitational acceleration scaled with 1/r^2 as it departed.
See. It's always aliens.
Human knowledge: Incomplete.
Measurement errors: Significant.
Something that doesn't immediately & neatly fit within our known parameters of natural phenomena: Aliens.
Well, yes. It's certainly "alien" in the sense that it's not fitting into usual categories. Could be a rock, though or it could be remnants of an ancient probe.
I'd like to think human vanity can be challenged and that we aren't alone out there
Well obviously, it'd be the bestest thing in the whole world ever of all time if it was really was evidence of ET.
But it's a rock. Almost certainly.
I'm being optimistic and romantic about it - I'm not a boffin, just a geek
If it *was* a probe, it exponentially increases the chances that SETI will find something.
If it wasn't (it wasn't) then SETI is still our best bet. We'll hear them long before they come to visit.
I'm not so sure...
Do we know where the "probe" came from? If we don't know its earlier trajectory we don't know which direction to look in. And as the man said, space is big, really big.
It's not unreasonable to assume that it must've come a long way, otherwise if it originated from a nearby star with ET life, one would think we might've have noticed them by now.
And if it came from a distant star, the volume to search increases exponentially. Even if ET sent it, knowing that may not help us actually find them.
The chances of us being targeted specifically seem fanciful, more likely this putative intelligent species searched for interesting solar systems, using similar techniques to that which we ourselves use, and then dispatched hundreds or thousands of probes, one to each candidate system. At a few % c it might take each probe many millennia to reach its target star, before taking some readings, beaming the info back to homebase then heading off somewhere else.
So if it is a probe we can't be sure which direction it originated from, we don't know if that was its course all along, we don't know how far its travelled, and don't even know if its progenitor race even still exists. Which doesn't really give SETI much help in pointing their telescopes.
And that's if it is a probe. Which it isn't. It's a rock.
I meant that physical evidence of ETs greatly increases the chances that we'll find radio evidence. We'd know for sure that there's something there to find. We'd have doubled the number of known intelligent species in the universe, which then influences the Drake equation.
Yep, it's aliens now - Alien spacecraft could have sailed past Earth, suggest Harvard scientists
This is fascinating science.
Wild Idea: What If Interstellar Visitor 'Oumuamua Is an Alien Light Sail?
And yet, across the gulf of space, minds immeasurably superior to us regarded this earth with envious eyes...
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