Author Topic: First Observation of an Interstellar Visitor  (Read 1391 times)

Tank

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Re: First Observation of an Interstellar Visitor
« Reply #15 on: December 12, 2017, 10:06:02 AM »
They took one good look at this place and said 'bugger that!'
Exactly!
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AngelOfDeath

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Re: First Observation of an Interstellar Visitor
« Reply #16 on: December 12, 2017, 05:41:16 PM »

oh yea.  the ultimate cold shoulder  ;D
« Last Edit: December 21, 2017, 06:55:32 AM by AngelOfDeath »

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Re: First Observation of an Interstellar Visitor
« Reply #17 on: December 20, 2017, 04:41:56 AM »
Apparently not a peep was heard from `Oumuamua.

Quote
No alien signals have been detected from an interstellar, cigar-shaped space rock discovered travelling through our Solar System in October, researchers listening for evidence of extraterrestrial technology said Thursday.

The object, dubbed Oumuamua, was spotted by several Earthly telescopes two months ago.

Given its weird trajectory, surprised researchers immediately concluded it was from beyond our planetary system—the first interstellar object ever identified in our midst.

The rock is thought to be about 400 metres (1,300 feet) long, and thin—only about 40 m wide, a never-before-seen shape for an asteroid.

After its discovery was announced last month, a project called Breakthrough Listen, dedicated to finding signs of extraterrestrial intelligence, said it would study the rock for artificial signals.

"No such signals have been detected" by its network of telescopes, the project said Thursday, adding: "the analysis is not yet complete".

[Continues . . .]

Its surface appearance is a fairly close match to objects found in our own solar system.

"Alien object 'Oumuama was a natural body visiting from another solar system" | PhysOrg

Quote
Scientists at Queen's University Belfast have led worldwide investigations into a mysterious object that passed close to Earth after arriving from deep interstellar space.Since the object was spotted in October, Professor Alan Fitzsimmons and Dr Michele Bannister from the School of Mathematics and Physics at Queen's University have led an international team of astronomers to piece together a profile of the strange visitor, which has been named `Oumuamua.

The team was made up of researchers from elsewhere in the UK, the US, Canada, Taiwan and Chile and in total seven researchers from Queen's were involved.

Professor Alan Fitzsimmons headed up a team which measured the way that `Oumuamua, reflects sunlight, and found it similar to icy objects covered with a dry crust. This is because `Oumuamua has been exposed to cosmic rays for millions, or even billions, of years, creating an insulating organic-rich layer on its surface.

The research, which has been published this week in Nature Astronomy, suggests that `Oumuamua's dry crust could have protected its icy interior from being vaporised - even though the object was just 23 million miles from our sun in September when it zipped past.

Professor Alan Fitzsimmons commented: "We have discovered that the surface of `Oumuamua is similar to small solar system bodies that are covered in carbon-rich ices, whose structure is modified by exposure to cosmic rays.

"We have also found that a half-metre thick coating of organic-rich material could have protected a water-ice-rich comet-like interior from vaporizing when the object was heated by the sun, even though it was heated to over 300 degrees centigrade."

[Continues . . .]

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Magdalena

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Re: First Observation of an Interstellar Visitor
« Reply #18 on: December 20, 2017, 06:03:09 AM »

xSilverPhinx

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Re: First Observation of an Interstellar Visitor
« Reply #19 on: December 20, 2017, 10:02:06 PM »

Don't lose hope. :therethere: The Mothership will come to take Trump home.

:P
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Re: First Observation of an Interstellar Visitor
« Reply #21 on: January 25, 2018, 12:59:20 AM »
A summation of current knowledge about ‘Oumuamua; the only newish thing I noticed is the note on a paper arguing that this observation implies that there is a very large number of these interstellar objects rattling around the galaxy.

'Update on an Interstellar Asteroid'

Quote
Since ‘Oumuamua’s discovery, scientists have been gathering as many observations of this body as possible before it vanishes into the distance. Simultaneously, theorists have leapt at the opportunity to explain its presence and the implications its passage has on our understanding of our surroundings. Here we present just a few of the latest studies that have been published on this first detected interstellar asteroid — including several timely studies published in our new journal, Research Notes of the AAS.

[Continues . . .]
"Religion is fundamentally opposed to everything I hold in veneration — courage, clear thinking, honesty, fairness, and above all, love of the truth."
— H. L. Mencken


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Re: First Observation of an Interstellar Visitor
« Reply #22 on: June 15, 2018, 01:04:30 AM »
A visitor that apparently came and stayed:

"First interstellar immigrant discovered in the solar system" | ScienceDaily

Quote
A new study has discovered the first known permanent immigrant to our Solar System. The asteroid, currently nestling in Jupiter's orbit, is the first known asteroid to have been captured from another star system. The work is published in Monthly Notices of the Royal Astronomical Society: Letters.

The object known as 'Oumuamua was the last interstellar interloper to hit the headlines in 2017. However it was just a tourist passing through, whereas this former exo-asteroid - given the catchy name (514107) 2015 BZ509 - is a long-term resident.

All of the planets in our Solar System, and the vast majority of other objects as well, travel around the Sun in the same direction. However 2015 BZ509 is different - it moves in the opposite direction in what is known as a 'retrograde' orbit.

"How the asteroid came to move in this way while sharing Jupiter's orbit has until now been a mystery," explains Dr Fathi Namouni, lead author of the study. "If 2015 BZ509 were a native of our system, it should have had the same original direction as all of the other planets and asteroids, inherited from the cloud of gas and dust that formed them."

However the team ran simulations to trace the location of 2015 BZ509 right back to the birth of our Solar System, 4.5 billion years ago when the era of planet formation ended. These show that 2015 BZ509 has always moved in this way, and so could not have been there originally and must have been captured from another system.

[Continues . . .]
"Religion is fundamentally opposed to everything I hold in veneration — courage, clear thinking, honesty, fairness, and above all, love of the truth."
— H. L. Mencken


Tank

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Re: First Observation of an Interstellar Visitor
« Reply #23 on: June 15, 2018, 06:23:55 AM »
Wow, just wow.
If religions were TV channels atheism is turning the TV off.
“Religion is a culture of faith; science is a culture of doubt.” ― Richard P. Feynman
'It is said that your life flashes before your eyes just before you die. That is true, it's called Life.' - Terry Pratchett
Remember, your inability to grasp science is not a valid argument against it.

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Re: First Observation of an Interstellar Visitor
« Reply #24 on: June 28, 2018, 12:36:11 PM »
Current thinking based on observations is that 'Oumuamua is an interstellar comet or an alien space probe cunningly disguised as such;)

"`Oumuamua gets a boost" | ScienceDaily

Quote
`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.

The team, led by Marco Micheli (European Space Agency) explored several scenarios to explain the faster-than-predicted speed of this peculiar interstellar visitor. The most likely explanation is that `Oumuamua is venting material from its surface due to solar heating -- a behaviour known as outgassing. The thrust from this ejected material is thought to provide the small but steady push that is sending `Oumuamua hurtling out of the Solar System faster than expected -- as of 1 June 2018 it is traveling at roughly 114,000 kilometres per hour.

Such outgassing is a behaviour typical for comets and contradicts the previous classification of `Oumuamua as an interstellar asteroid. "We think this is a tiny, weird comet," commented Marco Micheli. "We can see in the data that its boost is getting smaller the farther away it travels from the Sun, which is typical for comets."

Usually, when comets are warmed by the Sun they eject dust and gas, which form a cloud of material -- called a coma (cometary) -- around them, as well as the characteristic tail . However, the research team could not detect any visual evidence of outgassing.

"We did not see any dust, coma, or tail, which is unusual," explained co-author Karen Meech of the University of Hawaii, USA. Meech led the discovery team's characterisation of `Oumuamua in 2017. "We think that 'Oumuamua may vent unusually large, coarse dust grains."

[Continues . . .]
"Religion is fundamentally opposed to everything I hold in veneration — courage, clear thinking, honesty, fairness, and above all, love of the truth."
— H. L. Mencken


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