Now, remarkably, science fiction is morphing into science fact. Astrophysicist Prof Avi Loeb<\/a> of Harvard University believes \u2018Oumuamua<\/a>, a mysterious interstellar object that flew through the Solar System in 2017, may have been an alien Rama-like artefact. But being a scientist rather than a science fiction writer, he wants data. \u201cWith that in mind, I have set up Project Galileo<\/a>,\u201d he says. \u201cIts aim is to scan the heavens for the next \u2018Oumuamua and send a space mission to fly by it and photograph it.\u201d<\/p>\n More than 100 scientists, led by Loeb, are involved in Galileo. They are subtly shifting the emphasis of the Search for Extraterrestrial Intelligence (SETI) from looking for signs of alien biology or electromagnetic signals to hunting for objects as signs of alien technology. Loeb thinks this change is long overdue.<\/p>\n \u201cFor 70 years we\u2019ve been barking up the wrong tree,\u201d he says, alluding to the 70-odd years astronomers have been searching for intelligent radio signals from our Galaxy. \u201cThat search is predicated on the assumption that extraterrestrials communicate via radio waves, a technology we have used for just over a century and which advanced extraterrestrials may have long ago left behind,\u201d he adds. \u201cI think a better strategy is to look for artefacts: alien tech.\u201d<\/p>\n Not everyone agrees about this shift in emphasis of SETI. \u201cHowever, I would agree, that so-called artefact SETI seems to have got more traction lately,\u201d says Prof Jason Wright<\/a>, an astronomer and astrophysicist at Pennsylvania State University. He points out, though, that \u201cvery little searching is being done\u201d.<\/p>\n The best place to look for artefacts, says Loeb, is in the Solar System \u2013 our \u2018mailbox\u2019, where extraterrestrial \u2018packages\u2019 have been able to accumulate for 4.55 billion years.<\/p>\n Read more about searching for aliens:<\/strong><\/p>\n Alien technology could end up in our backyard either by design or by accident. In 1996, Dr Alexey Arkhipov<\/a> of the Institute of Radio Astronomy in Kharkiv, Ukraine, pointed out that bits of our own space technology are unavoidably ejected from the Solar System by events such as collisions in space and explosions, and that the same thing should happen in reverse, with material from alien spacefaring civilisations ending up in the Solar System.<\/p>\n By estimating that 1 per cent of nearby stars have been home to technological civilisations and that, over their history, they turn 1 per cent of the material of their asteroids into the extraterrestrial equivalent of consumer goods, Arkhipov concluded that the Earth, in its history, would have accumulated about 4,000 extraterrestrial artefacts the size of a Marmite jar.<\/p>\n The Earth has weather and geological activity which re-mould its surface, so any alien artefacts would be very hard to find. But other bodies in the Solar System, with surfaces that do not change, like the Moon, would be a better bet. \u201cThe Moon is like a museum,\u201d says Loeb. \u201cWe should scour its surface for equipment we did not send.\u201d<\/p>\n Inevitably, this conjures up images of the film version of another of Clarke\u2019s stories, 2001: A Space Odyssey<\/em>, in which a buried alien monolith is excavated in the Moon\u2019s Tycho Crater. Left by extraterrestrials who passed through the Solar System millions of years earlier, it is a \u2018baby alarm\u2019, put there to warn its makers when life on the third planet from the Sun emerges from its terrestrial cradle and crosses the gulf\u00a0of space to the Moon. Loeb says he is not fond of science fiction. Nevertheless, a lot of this ground has been trodden by writers like Clarke.<\/p>\n Recognising an alien technological artefact might not be easy. Alien civilisations could be as far from us in evolutionary terms as we are from ants. Or even bacteria. However, Loeb says if a caveman picked up a mobile phone, he would know it was different from a rock \u2013 though its purpose would be mysterious. \u201cSimilarly, we should look for things that differ from rocks,\u201d says Loeb. And he does not mean only on the surface of bodies in the Solar System, he means the space between the planets too.<\/p>\n That was where \u2018Oumuamua was spotted in late 2017 by the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) at Haleakala Observatory in Hawaii. It was quickly recognised to be travelling too fast to be a body trapped by the Sun\u2019s gravity. \u2018Oumuamua wildly varied the amount of light it reflected, indicating it had an extreme shape, most likely that of a flat pancake the size of a football pitch.<\/p>\n The most striking thing about \u2018Oumuamua was that it wasn\u2019t moving like a body influenced solely by the Sun\u2019s gravity. Something was pushing it away from the Sun. Comets outgas material and this acts like a rocket exhaust, pushing them in the opposite direction. But Loeb says that \u2018Oumuamua showed no evidence of material being ejected.<\/p>\n Others, however, maintain it is impossible to rule this out. \u201cThe amount of outgassing needed to explain the acceleration would have been too little to have been detected,\u201d says Prof Chris Lintott<\/a>, an astronomer at the University of Oxford. He also points out that, historically, several observations have claimed to be evidence of aliens before being shown to be natural. For example, the Martian moons Phobos and Deimos were thought to be hollow because of their low density, while pulsars were dubbed LGMs, for Little Green Men.<\/p>\n The existence of one object like \u2018Oumuamua from beyond the Solar System implies there should be others. And, in September 2020, 2020 SO was discovered by Pan-STARRS. Like \u2018Oumuamua, it was being pushed from the Sun without apparent cometary outgassing. However, when astronomers tracked its orbit back through time, they found that the intelligent civilisation it had come from was none other than\u2026 ours! 2020 SO appears to be the discarded Centaur upper stage of the rocket that propelled NASA\u2019s Surveyor 2 lander to the Moon in 1966.<\/p>\n Not surprisingly, Loeb\u2019s suggestion that \u2018Oumuamua was an alien artefact was controversial. Loeb found it odd that astronomers were prepared to propose exotic things never seen before such as a hydrogen iceberg, a chip of frozen nitrogen or a cloud of dust particles 100 times more rarefied than air, but were upset by the suggestion that \u2018Oumuamua may have come from an ET civilisation.<\/p>\n \u201cOne astronomer even said \u2018\u2018Oumuamua is so weird. I wish it hadn\u2019t existed,\u2019\u201d says Loeb. Meanwhile, Loeb was wondering, \u201cWho built \u2018Oumuamua? Could it be a piece of garbage? Might it be merely the skin of a larger vehicle that broke up?\u201d<\/p>\n Loeb is convinced the search within the Solar System for more objects like \u2018Oumuamua \u2013 and even much smaller \u2013 is worthwhile. And now he has the seed money to do it. It came about because Bill Nelson, head of NASA, gave a speech on 3 June 2021 in which he said a scientific analysis was needed of Unknown Aerial Phenomena (UAP) detected by a multitude of instruments. UAP are actually UFOs, renamed to remove the stigma. Former president Barack Obama called UAP \u201ca serious matter\u201d. On 5 June, Loeb emailed NASA to suggest the kind of scientific project Nelson was advocating but received no reply.<\/p>\n But while one door remained closed, another opened. The COVID-19 lockdowns have been a great opportunity for Loeb to stay at home and think. He has written many scientific papers, a bestselling book about \u2018Oumuamua called Extraterrestrial<\/em> and a huge textbook, Life In The Cosmos: From Biosignatures To Technosignatures<\/em>, with his former postdoctoral researcher Manasvi Lingam<\/a> of the Florida Institute of Technology. \u201cOne of the nice things is that many people have visited the porch of my house,\u201d he says. \u201cOne, who came a few weeks after I sent my email, was Frank Laukien, CEO of Bruker Corporation, a Massachusetts-based manufacturer of scientific equipment.\u201d<\/p>\n Laukien and other visitors donated a total of $2m: the money Loeb used to establish the Galileo Project, which was announced on 26 July. The project has two strands. The first, which Loeb envisages costing $100m, is to identify the nature of UAP. A battery of optical and infrared video cameras, radio and audio sensors will be installed on the roof of Harvard College Observatory in spring 2022 to monitor the sky 24 hours a day, with objects in the data being identified with artificial intelligence<\/a> algorithms.<\/p>\n The goal is to have many batteries around the world, scanning as much sky as possible. Loeb calls it a \u201cfishing expedition\u201d and says it is an attempt to inject sanity into the subject by bringing it into the scientific mainstream.<\/p>\n Things are moving on other fronts too. In December 2021, President Joe Biden created a new office, under the Department of Defense, to assemble data from all branches of government to get to the bottom of UAP.<\/p>\n The second strand of Galileo, which is envisaged as costing $1bn, is more ambitious. It is the search for the next \u2018Oumuamua and the design of a robotic mission to intercept its trajectory and take close-up photographs. This, Loeb admits, will be hard. \u201cIf we were to detect an intelligent radio signal from the nearest star, there would be little hurry to reply since the round-trip communication time would be a decade,\u201d he says. \u201cBut, if we spot something in the Solar System, we will have to move extremely quickly. \u2018Oumuamua was gone before we had much time to study it.\u201d<\/p>\n Even a mission to land on a second \u2018Oumuamua may not be out of the question. NASA achieved this in 2018 by landing its OSIRIS-REx spacecraft on asteroid Bennu and scooping up a sample, which returns to Earth in 2023.<\/p>\n \u201cIf there is alien tech, it may represent more than a scientific opportunity,\u201d says Loeb. \u201cIt could also be a business opportunity for importing the new technology to Earth!\u201d<\/p>\n Lintott says that: \u201cIf Project Galileo gets people excited about understanding interstellar objects entering the Solar System, that would be fabulous.\u201d He says the European Space Agency is already planning the Comet Interceptor<\/a> mission, which will be able to fly to a body like \u2018Oumuamua. \u201cThe plan is for it to lurk in space waiting for a suitable target, whether that turns out to be a comet visiting the inner Solar System for the first time or an interstellar object.\u201d<\/p>\n All this focus on the Solar System may appear reminiscent of a drunk who has lost his car keys at midnight and is searching for them under a streetlight \u2013 not because that is where they are likely to be found but because that is the only place he can sensibly look. Nevertheless, Loeb thinks it is worth carrying out a thorough search of our backyard because nobody has yet.<\/p>\n \u201cIn the words of Robert Frost, it is taking \u2018the road less travelled\u2019. And, whenever you do that, there is always the possibility of finding low-hanging fruit,\u201d he says.<\/p>\n Looking beyond the Solar System is harder. But Loeb thinks that searching for technosignatures is still a better bet than looking for biosignatures of microbes, the principal aim of astrobiologists. The main biomarkers are oxygen and methane, both of which can exist in a planetary atmosphere only if they are constantly replenished.<\/p>\n Currently, more than\u00a04,000 planets beyond our Solar System are known. As they orbit their parent stars, some pass between the star and Earth, so starlight passes through their atmospheres. Oxygen and methane take bites out of the starlight at characteristic wavelengths which are their \u2018spectral fingerprints\u2019. \u201cThe problem,\u201d says Loeb, \u201cis that for the first two billion years of life on Earth there was little oxygen in the atmosphere. And both oxygen and methane can have non-living sources.\u201d<\/p>\n A better bet, Loeb believes, is to look not for the chemicals of biology but of technology. He suggests compounds like chlorofluorocarbons, or CFCs \u2013 once used on Earth as refrigerants and spray-can propellants, and famous for their ozone-layer-destroying properties. \u201cThey could be detected in the atmosphere of planets around nearby stars by NASA\u2019s 6.5-metre James Webb Space Telescope<\/a>,\u201d he says.<\/p>\n But there are other signs, such as alien megastructures. For a time, it looked as if KIC 8462852, also known as Tabby\u2019s Star<\/a>, was fluctuating wildly in brightness and it might be orbited by such structures, possibly giant starlight collectors. But the behaviour of the star turned out to be the result of dust in the Solar System.<\/p>\n Loeb says that light sails pushed by mega-lasers are a plausible means of extraterrestrial transport, and we might detect the overspill of such light. Also, if an alien civilisation collected starlight by covering its planet with photovoltaic panels, it would cause its surface to reflect light differently from rock and ocean.<\/p>\n By a piece of good fortune, the nearest star, Proxima Centauri, has a planet. The planet, Proxima Centauri b, is 20 times closer to its star than Earth is to the Sun. But because Proxima Centauri is a cool, red dwarf star that\u2019s 500 times less luminous than the Sun, the planet is potentially habitable. Like our Moon, the planet is tidally locked, causing one side to be in permanent day while the other is in permanent night.<\/p>\n \u201cAn alien civilisation might live on the night side but cover the light side with photovoltaic panels,\u201d says Loeb. About 0.1 per cent of the Earth\u2019s surface is illuminated with artificial lights, but Loeb estimates that if 10 per cent of Proxima Centauri b\u2019s night side is similarly illuminated, this would be detectable from Earth by the James Webb Space Telescope, which was launched on Christmas Day.<\/p>\n Loeb accepts the possibility that extraterrestrials may be very difficult to find. They may be hiding, for instance, because it is a dangerous Universe and, if you signal your presence, you get wiped out. If so, it might be too late for us since our radio broadcasts have already reached thousands of nearby stars!<\/p>\n But even if ETs are not hiding, they may have decided to stay at home and live in a cyber cocoon, like Facebook\u2019s proposed Metaverse<\/a>. This is another possibility anticipated by Clarke in his 1949 novella, The Lion Of Comarre<\/em>, which described a future in which for many the virtual world is more seductive than reality.<\/p>\n Of course, aliens who are millions or even billions of years ahead of us in evolutionary terms are likely to be, as Clarke pithily observed, \u201cindistinguishable from magic\u201d.<\/p>\n \u201cA sufficiently advanced intelligence might even be a good approximation of God,\u201d says Loeb. \u201cIt would be able to create life from non-life and maybe even manipulate laws of physics to make new universes.\u201d<\/p>\n What might be the benefits of finding advanced extraterrestrial artefacts? Well, we would know it is possible to survive planetary cataclysms such as global warming. Hopefully, we would be inspired to keep pushing forward the frontiers of scientific knowledge.<\/p>\n Most importantly, says Loeb, knowledge of the existence of an alien civilisation would make differences between people on Earth appear trivial. \u201cIn the 20th Century, denial of this caused the deaths of 3 per cent of the world\u2019s population at the hands of the Nazis and others,\u201d says Loeb. \u201cETs would show us more unites us than divides us.\u201d<\/p>\n As for the chance of finding an ET artefact, Wright confesses: \u201cI don\u2019t know!\u201d Loeb, however, is more optimistic. \u201cMost stars formed billions of years before the Sun,\u201d he says. \u201cFor that reason, I think the chances are very good.\u201d<\/p>\n Read more about alien life:<\/strong><\/p>\n By Marcus Chown Published: Sunday, 20 March 2022 at 12:00 am In Arthur C Clarke\u2019s award-winning 1973 novel, Rendezvous With Rama, a mysterious 50-kilometre-long cylindrical spacecraft enters the Solar System. A space mission is mounted to intercept it and study it before it flies back out and is swallowed up by the darkness of interstellar […]<\/p>\n","protected":false},"author":24,"featured_media":11002,"template":"","categories":[54],"acf":{"readingTimeMinutes":"14"},"uagb_featured_image_src":{"full":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/03\/project-galileo-the-search-for-alien-tech-hiding-in-our-solar-system.jpg",1200,800,false],"thumbnail":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/03\/project-galileo-the-search-for-alien-tech-hiding-in-our-solar-system-150x150.jpg",150,150,true],"medium":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/03\/project-galileo-the-search-for-alien-tech-hiding-in-our-solar-system-300x200.jpg",300,200,true],"medium_large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/03\/project-galileo-the-search-for-alien-tech-hiding-in-our-solar-system-768x512.jpg",768,512,true],"large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/03\/project-galileo-the-search-for-alien-tech-hiding-in-our-solar-system-1024x683.jpg",800,534,true],"1536x1536":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/03\/project-galileo-the-search-for-alien-tech-hiding-in-our-solar-system.jpg",1200,800,false],"2048x2048":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/03\/project-galileo-the-search-for-alien-tech-hiding-in-our-solar-system.jpg",1200,800,false]},"uagb_author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/author\/importmanagerhubsprylab-com\/"},"uagb_comment_info":0,"uagb_excerpt":"By Marcus Chown Published: Sunday, 20 March 2022 at 12:00 am In Arthur C Clarke\u2019s award-winning 1973 novel, Rendezvous With Rama, a mysterious 50-kilometre-long cylindrical spacecraft enters the Solar System. A space mission is mounted to intercept it and study it before it flies back out and is swallowed up by the darkness of interstellar…","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/rss_feed\/11001"}],"collection":[{"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/rss_feed"}],"about":[{"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/types\/rss_feed"}],"author":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/users\/24"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/media\/11002"}],"wp:attachment":[{"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/media?parent=11001"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/categories?post=11001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Alien artefacts in our Solar System<\/h2>\n
![\""Still\"](\""https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/4\/2022\/03\/Monolith-2001-A-Space-Odyssey-a818950.jpg?quality=90&resize=620%2C296"\" "\\"\"The\\"")
<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>Identifying \u2018Oumuamua<\/h2>\n
![\""'Oumuamua"\"](\""https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/4\/2022\/03\/Oumuamua-8a5bb37.jpg?quality=90&resize=620%2C388"\" "\\"\"\u2018Oumuamua\\"")
<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>![\""Prof\"](\""https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/4\/2022\/03\/Prof-Avi-Loeb-2a74f44.jpg?quality=90&resize=620%2C930"\" "\\"\"Astrophysicist\\"")
<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>Project Galileo<\/h2>\n
![\""Laser\"](\""https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/4\/2022\/03\/Laser-reflector-Apollo-14-1a3a62b.jpg?quality=90&resize=620%2C620"\" "\\"\"Astronauts\\"")
<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>![\""A\"](\""https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/4\/2022\/03\/Bennu-surface-OSIRIS-REx-ad5b7e3.jpg?quality=90&resize=620%2C310"\" "\\"\"A\\"")
<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>Searching deep space<\/h2>\n
![\""Artist\u2019s\"](\""https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/4\/2022\/03\/Proxima-Centauri-b-e243e28.jpg?quality=90&resize=620%2C402"\" "\\"\"Artist\u2019s\\"")
<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>Shy aliens<\/h2>\n
","protected":false},"excerpt":{"rendered":"