Sunday , December 5 2021

Oumuamua: SETI study strange asteroid with & # 39; & # 39 form; cigar


Our first interstellar visitor is not trying to phone us, or at home – or anywhere else – SETI announced. But that did little to clarify exactly x & # 39; is the mysterious object.

Oumuamua – Hawaiian for Messenger – is contrary to that seen previously.

Can & # 39; is an asteroid. Can & # 39; be a comet. Maybe it's … something else. But ever since mankind spottedha the last year, Oumuamua – the elongated blocks & # 39; something that chose our Solar System – has managed to give the skip.

The SETI Institute use the Allen Telescope Arrangement (ATA) to monitor the object for several weeks after it was first identified and located some 274 million km & # 39; away.

After issuing the background noise, the telescope b & # 39; his health radio telescope showed that Oumuamua had not made a peep.

So the chances of it interstellar space probe took a dive. Or, at least that one is functional.


He is behaving weirdly: flying through our solar system parabola open-ended, and show that it must come from deep interstellar space.

It is exceptionally shiny: shiny as some astronomers speculated that can & # 39; is revealing with the solar wind power.

It aċċelerating: only a tiny amount, but something is giving Oumuamua bit & # 39; boost. Can & # 39; has "gas out" as a comet. But in no time the strange object m & # 39; shall be deemed to tail.

It has a strange shape. Based on his erratic flashing, the iddedudu Oumuamua astronomers to be long and thin. The asteroids and comets known simply not like that.

So the SETI interest.

As part of the initiative Breakthrough Listen, SETI argued that if "Oumuamua was artefact – is likely to transmit radio signals to us, f & # 39; any direction, or was simply irradiated as part of its mechanical operation.

No luck. Been heard interstellar broadcast. Do not found any probing radar.

"We were looking for a sign to prove that this object incorporates a technology – it was & # 39; artificial", says the researcher Gerry Harp. "Do not encountered these emissions, although quite sensitive search. While our observations jiddeskrivewx b & # 39; conclusive way unnatural origins" Oumuamua ", is an important date to access its likely shape."

But our chances to learn something more from our first known interstellar visitors are thin. He races away – back into deep space – f & # 39; about 95,000 km / h.

But the SETI still holds hope.

It is interested in & # 39; other strange objects in our Solar System.

"It has been long exposed to some of the latter may be interstellar probes, and radio observations offer a way to address this imaginative idea, but by no means impossible," says f & # 39; document .

Is there life in the Universe?


NASA last month published a study stating that, when indicate Spazer its infrared telescope spacing to Oumuamua f & # 39; November of last year, saw … nothing.

That is, in itself, telling.


"Oumuamua was light for Spitzer to detect when he looked more than two months after the closest approach to the object at the earliest in World & # 39; September", says NASA. "However, 'non & # 39; discovery" puts new limits on how big the strange object can & # 39; is. "

It also indicates that seemed Oumuama b & # 39; unusual way.

When Oumuamua had first appeared bloody after the Sun, had no apparent tail – as do comets – ice caused by boiling & # 39; out in space.

RELATED: Our first visitor interstellar really alien space probe?

But, since then, the item interstellar been noted to alter course slightly – and accelerates a little – like comets, under ice thrust heated by sunlight at & # 39; injected gas.

It alien space probe, since academic Harvard (himself a proponent to send probes to nearby Proxima) suggests?

Or is it something else – a strange mixture of & # 39; interstellar different ingredients than anything ever seen?

media_cameraConcept & # 39; artist & # 39; the asteroid interstellar 1I / 2017 U1 ( "Oumuamua") which came from the solar system after its discovery in & # 39; October 2017. Observations & # 39; "Oumuamua indicate to be a very prolonged because of the dramatic fluctuations in room light. Picture: European Southern Observatory / M Kornmesser


The new study now suggests that "Oumuamua can & # 39; be up to 10 times more reflective than Komet usually found in our solar system.

This is surprising.

"Oumuamua was traveling through & # 39; interstellar space million & # 39; years, & # 39; away from any stars that you & # 39; re & # 39; spans its surface," says this NASA report. "But it & # 39; have his face updated by & # 39; ' degassing "when made extremely close approach our Solar, a little more than five weeks before it was discovered."

Such "degassing" was cracked & # 39; away and maize on the surface of & # 39; Oumuamua, and potentially new deposits allowed & # 39; ice reflects much to repair in & # 39; place.

And this light can & # 39; Oumuama caused that look larger than actually to optical telescopes, such as Hubble.

NASA now think is less than half the original estimate of its size, and is instead x & # 39; anywhere between 400m and 100m long.

"Usually, if it is to achieve measurements comet font & # 39; weird, go back and judge again until we understand what we see," said Davide Farnocchia, of NASA. "But this one is gone forever, we probably know as much about it as we will never know."

NASA concludes that the gas jets from the vents in the face of & # 39; & # 39; Oumuamua gave it a slight boost in speed, as suggested earlier this year.

The Spitzer Space Telescope observations of – though not benefited from & # 39; Oumuamua & # 39; – proves to be small enough to place such acceleration.

"That determination depended on" Komet Oumuamua be relatively smaller than the typical solar system ", says the NASA.

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"Oumuamua got first the telescope Pan-Starr 1 & # 39; University & # 39; Hawaii on Haleakala, Hawaii, f & # 39; October of last year. Its name is a word Hawaiian which means "a visitor from afar to come first".

Hubble had a look. So did several telescopes based on the ground. They saw that it was reflecting the sunlight – but would vary with & # 39; dramatically. This suggested that Oumuamua was prolonged, and less than 800 meters.

media_cameraVariation of solar light to get propulsion from sunlight reflected, or laser light. Picture: Josh Spradling / The Planetary Society


Does nothing to confirm – or deny – recent controversial claims by two professors & # 39; Harvard, Shmuel Biały and Abraham Loeb.

"Most exotic scenario is that" Oumuamua can & # 39; to be fully operational intentionally probe sent to Earth from alien civilization ", they wrote.

RELATED: The US military has space machine "impossible"

But this was pure speculation, based solely on the unusual speed and course of the article.

It was so reflexive can & # 39 ;, however, adds fuel to the idea of ​​& # 39; & # 39; alien space probe & # 39 ;. The sails light work with & # 39; similarly the wind sail done – using energy from solar wind by jirriflettihom f & # 39; other direction to generate thrust.


And the smaller size calculated from observation & # 39; Spitzer also proponents of & # 39; probe & # 39; space & # 39; argument that it will lay off: the professors & # 39; Harvard themselves propose "the star chips" – small probes sailing saw solar sun – launched in nearby stars.

Professor of the University & # 39; Curtin University & # 39; the Radio Astronomy, Steven Tingay, said the reaction among his fellow scientists to work this idea was surprising.

"On social media, there were some pretty personal attacks scientists – at Loeb b & # 39; in particular – to the media for this job," he writes in & # 39; The Conversations.

"No scientist said that" foreign Oumuamua is in & # 39; this discussion – just raised questions and answers explained. M & # 39; there is no doubt that go beyond proper discussion on the search for extraterrestriċi intelligence, or being personally critical of colleagues … If foreign demand, direct and robust evidence is needed – not based conclusion on a few observations that are difficult to explain, together with & # 39; & # 39 bunch; assumptions. "

The search for life

The NASA observations make it more likely that Oumuamua is, in fact, dirty interstellar comet, stripped of deposits & # 39; & # 39 thousands; years in interstellar space. Once close to the Sun to boil it away, the heart & # 39; inside shiny exposed – changing its properties with & # 39; such as to alter its orbit.

We never know for certain, though.

M & # 39; there is no way to get a good look at the rapidly withdrawing enigma.

But probably we have not already heard about her end of the & # 39; now.

"He x & # 39; is" Oumuamua is (almost certainly not made by aliens, in my opinion), is a fascinating object and presents a very interesting scientific questions to initiate further studies and observations, "says Tingay Professor.

Originally published as searching for life on the visitors 'alien'

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