Earth’s first interstellar visitor is neither an alien aircraft nor a comet, as some scientists previously speculated when whizzed through our Solar System in 2017.
A new study from
The team also determined that the remnant is not shaped like a cigar, as previously stated, but is flat like a pancake with a surface of frozen nitrogen.
However, Oumuamua may not have ejected as a flat chunk, but melted into the form when it traveled closer to the sun.
Alan Jackson, an astronomer and planetary scientist at Arizona State University, said: ‘Being made of frozen nitrogen also explains the unusual shape of Oumuamua.’
‘As the outer layers of nitrogen ice evaporated, the shape of the body would have become progressively more flattened, just like a bar of soap does as the outer layers get rubbed off through use.’
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Oumuamua is nothing more than a chunk from a Pluto-like planet that was blasted off from its home some 400 million years ago, a study suggests. The object is also flat like a pancake and not shaped like a cigar as previously speculated
Jackson, along with his colleague Steven Desch, analyzed observations of Oumuamua captured in 2017, allowing them to determine several characteristics in order to determine its makeup.
‘In many ways ‘Oumuamua resembled a comet, but it was peculiar enough in several ways that mystery surrounded its nature, and speculation ran rampant about what it was.’
All of the remnant’s initial observations suggested it was comet, there are some characteristics that have never been observed in one soaring through the solar system – it is 10 times as long as it is wide and extremely flat.
The team combined data on its size, shine and shape, which led them to conclude that Oumuamua is most likely a gradually eroding chunk of icy nitrogen.
The object is our first interstellar visitor was spotted whizzing through the solar system in 2017, which led to a number of theories – some said it was an alien craft. Pictured is a concept image created from previous observations
However, Oumuamua may not have ejected as a flat chunk, but melted into the form when it traveled closer to the sun. Scientist say it traveled from a distant solar system into our own
Desch and Jackson’s conclusion holds weight after they determined solid nitrogen matches the object’s features.
And since solid nitrogen ice has been observed on the surface of Pluto, it is possible Oumuamua’s parent planet was similar.
‘We knew we had hit on the right idea when we completed the calculation for what albedo (how reflective the body is) would make the motion of ‘Oumuamua’ match the observations,’ Jackson said.
‘That value came out as being the same as we observe on the surface of Pluto or Triton, bodies covered in nitrogen ice.’
‘Although Oumuamua’s comet-like nature was quickly recognized, the inability to immediately explain it in detail led to speculation that it is a piece of alien technology.’
The team analyzed observations of Oumuamua captured in 2017, allowing them to determine several characteristics in order to determine its makeup
Researchers combined data on its size, shine and shape, which led them to conclude that Oumuamua is most likely a gradually eroding chunk of icy nitrogen. Since solid nitrogen ice can be seen on the surface of Pluto (public), it is possible Oumuamua’s parent planet was similar
‘Everybody is interested in aliens, and it was inevitable that this first object outside the solar system would make people think of aliens,’ Desch said.
‘But it’s important in science not to jump to conclusions. It took two or three years to figure out a natural explanation—a chunk of nitrogen ice—that matches everything we know about Oumuamua.’
That’s not that long in science, and far too soon to say we had exhausted all natural explanations.’
The idea that the object was an alien aircraft came from Harvard physicist Avi Loeb who believes it is a discarded rocket.
Perhaps ‘Oumuamua was like a buoy resting in the expanse of the universe,’ writes Loeb.
Oumuamua was discovered in October 2017 by a telescope in Hawaii millions of miles away. The red-tinged rock is estimated to be possibly 1,300 feet long and zooming away from the Earth and sun at more than 16 miles per second
Like a trip wire left by an intelligent lifeform, waiting to be triggered by a star system.
Loeb’s ideas have placed him at odds with fellow astronomers.
Writing in Forbes, astrophysicist Ethan Siegel called Loeb a ‘once-respected scientist’ who, having failed to convince his peers of his arguments, had taken to pandering to the public.
Loeb, for his part, protests a ‘culture of bullying’ in the academy that punishes those who question orthodoxy — just as Galileo was punished when he proposed the Earth was not the center of the universe.
AN INTERSTELLAR VISITOR: WHAT IS ‘OUMUAMUA AND WHAT DO WE KNOW ABOUT IT?
A cigar-shaped asteroid named ‘Oumuamua sailed past Earth at 97,200mph (156,428km/h) in October.
It was first spotted by a telescope in Hawaii on 19 October, and was observed 34 separate times in the following week.
It is named after the Hawaiian term for ‘scout’ or ‘messenger’ and passed the Earth at about 85 times the distance to the moon.
It was the first interstellar object seen in the solar system, and it baffled astronomers.
Initially, it was thought the object could be a comet.
However, it displays none of the classic behaviour expected of comets, such as a dusty, water-ice particle tail.
The asteroid is up to one-quarter mile (400 meters) long and highly-elongated – perhaps 10 times as long as it is wide.
That aspect ratio is greater than that of any asteroid or asteroid observed in our solar system to date.
But the asteroid’s slightly red hue — specifically pale pink — and varying brightness are remarkably similar to objects in our own solar system.
Around the size of the Gherkin skyscraper in London, some astronomers were convinced it was piloted by aliens due to the vast distance the object traveled without being destroyed – and the closeness of its journey past the Earth.
Alien hunters at SETI – the Search for Extra-terrestrial Intelligence based at Berkeley University, California said there was a possibility the rock was ‘an alien artefact’.
But scientists from Queen’s University Belfast took a good look at the object and said it appears to be an asteroid, or ‘planetesimal’ as originally thought.
Researchers believe the cigar-shaped asteroid had a ‘violent past’, after looking at the light bouncing off its surface.
They aren’t exactly sure when the violent collision took place, but they believe the lonely asteroid’s tumbling will continue for at least a billion years.
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