UFOs have fascinated and puzzled people for decades, yet hard evidence seems ever elusive. Many people are convinced that not only are extraterrestrials visiting Earth, but that governments have perpetuated a top-secret global conspiracy to cover it up. Here's a look at UFOs throughout history.
Today, most people equate UFOs with extraterrestrial intelligence and advanced technologies, but this is a very recent idea. That's not to say that historically people did not report seeing unusual things in the skies, for they surely did: comets, meteors, eclipses and the like had been reported (and sometimes recorded) for millennia — in fact some researchers believe that the Star of Bethlehem may have been an illusion created by a merging of Jupiter and Saturn, which occurred right around Jesus' birth).
But it's only been in the past century or so that anybody assumed that unknown lights or objects in the sky were visitors from other planets. Several of the planets had been noticed for millennia, but were not thought of as places where other living creatures might reside (for example ancient Greeks and Romans thought the planets were gods).
Early science fiction writers like Jules Verne and Edgar Allan Poe fueled the public's interest in voyages to other worlds, and as technology developed some people began to wonder if that might not indeed be possible for advanced civilizations. The first reports of what could be called UFOs emerged in the late 1800s, though in those days they didn't use terms like "UFO" or "flying saucer," but instead "airships."
UFO sightings
Early newspaper hoaxes aside, there have been countless UFO reports over the decades, and a few of them stand out as especially important. The first report of a "flying saucer" dates back only to 1947 when a pilot named Kenneth Arnold reported seeing nine objects resembling boomerangs in the sky. He described their movement as "like a saucer if you skip it across the water," which a careless reporter misunderstood as saying that the objects themselves resembled "flying saucers," and that mistake launched many "flying saucer" reports in later decades. Investigators think that Arnold probably saw a flock of pelicans and misjudged their size, their large wings creating the "V" shape he described.
The most famous UFO crash allegedly occurred when something — skeptics say a top-secret spy balloon; believers say a spacecraft with alien pilots — crashed on a ranch in the desert outside of Roswell, New Mexico, in 1947, and the debate rages to this day.
The first UFO abduction case — and to this day the most famous — was that of Barney and Betty Hill, an interracial couple who in 1961 claimed to have been chased down and abducted by a UFO. However, since there were no other eyewitnesses to the event and they didn't report the abduction at the time (only remembering it under hypnosis), many remain skeptical.
Another famous UFO sighting occurred near Phoenix, Arizona, in March 1997 when a series of bright lights were reported in the night skies. Though it is known that the military dropped flares over a nearby proving ground during routine exercises around the time of the sightings, UFO buffs dismiss the government's explanation of the lights and insist there's more to the story.
Since then, a host of UFO sightings have been reported. Here are a handful that in recent years got a lot of attention, with links to articles from the time:
Jan. 7, 2007: Strange lights over Arkansas fueled much speculation on the Internet until the Air Force debunked the UFO claims, explaining that flares had been dropped from airplanes as part of routine training.
April 21, 2008: Phoenix lights were reported again. It was a hoax, created by road flares tied to helium balloons. The hoaxer admitted it, and eyewitnesses reported seeing him do it.
Jan. 5, 2009: New Jersey UFOs that proved so baffling they were reported on the History Channel turned out to be helium balloons, red flares and fishing lines, all part of a social experiment. The men who perpetrated the hoax, Joe Rudy and Chris Russo, were fined $250 for creating what could have been a danger to the nearby Morristown airport.
October 13, 2010: UFOs over Manhattan turned out to be helium balloons that escaped from a party at a school in Mount Vernon.
Jan. 28, 2011: Videos of UFOs hovering over the Holy Land (the Dome of the Rock on Jerusalem's Temple Mount) was revealed as a hoax — the effects of video editing software's use were discovered.
July 2011: The sighting of a UFO on the ocean floor was attributed to a Swedish scientist, but that researcher, Peter Lindberg, merely said the thing he detected in blurry images was "completely round," an assertion not supported by the low-resolution sonar image. A second "anomaly" made the case seem even more bizarre, but no evidence has emerged to suggest alien origin.
Peter Lindberg's team found what appears to be a crashed flying saucer on the ocean floor. (Image credit: www.oceanexplorer.se)
April 2012: A UFO near the sun, spotted in a NASA image, turned out to be a camera glitch.
April 2012: A viral UFO video taken from a plane over South Korea likely showed a droplet of water on the airplane's window.
May 2012: A nephew of the famous Wayans brothers comedy team, Duayne "Shway ShWayans" Wayans, filmed a UFO over Studio City, Calif. But like many, many UFO sightings, this one turned out to be the planet Venus. In fact, even airline pilots have mistaken Venus for a UFO.
UFOs and Aliens Among Us
In the 1940s and 50s reports of "flying saucers" became an American cultural phenomena. Sightings of strange objects in the sky became the raw materials for Hollywood to present visions of potential threats. Posters for films, like Earth vs. the Flying Saucers from 1956 illustrate these fears. Connected to ongoing ideas about life on the Moon, the canals on Mars, and ideas about Martian Civilizations, flying saucers have come to represent the hopes and fears of the modern world.
Are these alleged visitors from other worlds peaceful and benevolent or would they attack and destroy humanity? The destructive power of the Atomic bomb called into question the progressive potential of technology. Fear of the possibilities for destruction in the Cold War-era proved fertile ground for terrestrial anxieties to manifest visions of flying saucers and visitors from other worlds who might be hidden among us in plain sight.
Aliens Among us and Fears of the Other
If UFOs were visiting our world, where were these extraterrestrials? Could they be hidden among us? Comic books and television illustrates how the possibility of extraterrestrial visitors reflected anxieties of that era.
The 1962 comic There are Martians Among Us, from Amazing Fantasy #15, illustrates the way fear of extraterrestrials could reflect Cold War anxieties. In the comic, a search party gathers around a landed alien craft, but it can find no sign of alien beings. Radio announcers warn those nearby to stay indoors. The action shifts to a husband and wife as he prepares to leave their home despite a television announcer's warning to remain indoors. As he waves goodbye he reminds his wife to stay inside. The wife however decides to slip out to the store and is attacked and dragged off. The husband returns home and finding it empty runs towards the telephone in a panic. In a twist, the anxious husband reveals that he and his wife are the Martians.
The fear that there might be alien enemies in our midst resonates with fears of Soviets and communists from the McCarthy era. Ultimately, in this story, the humans are the ones who accost and capture the alien woman. The shift in perspective puts the humans in the position of the monsters.
UFOs as Contemporary Folklore
Aside from depictions of UFOs in media, UFOs are also part of American folk culture. Ideas of aliens and flying saucers are a part of the mythology of America. You can find documentation of these kinds of experiences in folk life collections. An interview with Howard Miller about hunting and hound dogs, collected as part of Tending the Commons: Folklife and Landscape in Southern West Virginia collection, documents an individual's experience with a potential UFO sighting.
In A mysterious light, a segment of an ethnographic interview, Miller describes a strange light he saw once while hunting with his dogs in 1966 "All at once it was daylight, and I looked up to see what happened. There was a light about that big, going up, drifting up the hill. When I looked and seen it just faded out. I've been in the Marines, and know what airplane lights look like, and it was too big for that." When asked if he knew what it was he offered, "I don't know what it was" but went on to explain, "If there is any such thing as a UFO that's what that was." This unexplained light on a walk in the woods is typical of many stories of these kinds of encounters. It's not only the media that tells stories and represents these kinds of ideas, documentation of the experiences and stories Americans tell each other is similarly important for understanding and interpreting what UFOs meant to 20th century America.
Skepticism of UFOs and Alien Encounters
Scientists and astronomers express varying degrees of enthusiasm for the possibility of intelligent life in the universe. However, scientists generally dismiss the idea that there are aliens visiting Earth. In Pale Blue Dot: A Vision of the Human Future in Space, Carl Sagan reviews the possibilities of alien visitors to Earth, and suggests that there is good reason to be skeptical of them. Much of Sagan's work focuses on debunking folk stories and beliefs and tries to encourage more rigorous and skeptical thought. He similarly discussed criticism of beliefs in alien visitors in his earlier book, Demon Haunted World: Science as a Candle in the Dark.
This zealous criticism of belief in UFOs from Sagan, who was well known for his speculative ideas about the likelihood of alien civilizations, might seem to be a contradiction. Sagan himself had even speculated on the possibilities of visits by ancient aliens in his essay from the early 60s Direct Contact among Galactic Civilizations by Relativistic Interstellar Spaceflight.
How do we reconcile Sagan the skeptic with the imaginative Sagan? Far from a contradiction, these two parts of Sagan's perspective offer a framework for understanding him and the interchange between science and myth about life on other worlds. Skepticism and speculative imagination come together as two halves of the whole. It's essential to entertain and explore new ideas, however strange, while at the same time testing and evaluating the validity of those ideas.
Alien territory: the rise of UFO tourism
Far from being conspiracy theorists, many visitors to remote sites such as Area 51 and Roswell are simply adventurous travellers, keen to know the answer to the question: is the truth really out there?
From the gate, Area 51 looks deserted. It would be so easy to simply step over the dotted line in the road here, to enter America’s most mysterious military installation. But Nate Arizona knows better.
“Don’t even think about it,” warns my previously jovial guide, brow furrowing under his neon-coloured bandana. “You’d be face first in the dirt with a gun to the back of your head before you knew what was happening.”
For alien enthusiasts, this is ground zero. The secret air force base in Nevada has been at the centre of extra-terrestrial speculation since the 1940s. Many believe UFO wreckage from the infamous Roswell Incident of 1947 is hidden inside this perimeter — along with the remains of its intergalactic pilots. Others speculate that the facility is dedicated to the reverse engineering of recovered alien technology, or even time travel. Whichever way you cut it, an awful lot of people believe that if the truth is out there, it’s probably in here.
The ‘Storm Area 51’ Facebook joke, which went viral earlier this summer (with two million people signing up for the mass invasion of the facility in order to ‘see them aliens’) put this highly classified military base firmly back in the public eye. But another trend has been growing out here too: that of UFO tourism.
Nate’s own tour, which also takes in the nearby Extraterrestrial Highway and the tiny town of Rachel — a hub of purported paranormal activity — recently became one of Airbnb’s ‘experiences’, and bookings are landing faster than the Martian invasion force in HG Wells’ classic sci-fi novel The War of the Worlds.
“People get very excited about coming out to Area 51, but once we arrive at the gates, they realise how serious the whole thing is,” says Nate as we march along the perimeter, looking for a better vantage point. “The US government didn’t even officially admit this place existed until 2013, after all. There are motion sensors and cameras everywhere, and they follow your every move. Don’t be under any illusion — there are multiple guards watching us right now.”
Those guards are what ufologists call ‘camo guys’ — the real-life equivalent of the Men in Black from the Hollywood film. I’ve heard these defenders of the Earth drive unmarked white SUVs, sitting sphinx-like behind mirrored sunglasses as they trail visitors from a discreet distance. Sure enough, as we approach another gate, Nate spots a white SUV parked on a bluff, which flashes its headlights as we approach.
“The camo guys are just letting us know they’re there,” says Nate. “Don’t worry — as long as we don’t enter the base proper, we’ll be absolutely fine.”
Under these watchful eyes, we continue our exploration, Nate pointing out satellite towers, barracks and even a bizarre mirrored pyramid visible within the perimeter. As we pass, mounted cameras grind and whir in our direction and the inscrutable SUV maintains its vigilant watch.
Shadows slowly lengthening, we finally retreat to Rachel — a dusty, one-horse town a bumpy, eight-mile drive from Area 51. At its only motel, the appropriately monikered ‘Little A’Le’Inn’, manager Cody Theising says they too have seen a noted uptick in bookings as UFO tourism has taken off.
“There’s definitely been an increase in business out here in the last couple of years; we’re seeing a lot more tours like yours coming through,” says Cody, as I sip one of the Little A’Le’Inn’s signature ‘Spiced Abduction’ cocktails next to a sign that reads ‘Earthlings Welcome’.
“We’re still getting the diehard UFO fans, of course, but the majority of new guests are normal people like you or me, who’ve seen Area 51 mentioned on the news or in a movie and are curious to check it out for themselves. They come out on road trips from Las Vegas and they’re looking to tick this place off their bucket lists — to stay overnight and have a story and images to share on social media before driving on.”
The new (para)normal
It’s that ‘normal’ clientele on road trips, as opposed to the committed conspiracy theorists, that’s driving the current trend — causing a rise in bookings both here and at other UFO hotspots. Inevitably, that list also includes Roswell, New Mexico, the site of the most famous alleged UFO crash, in July 1947, and what many believe was the mother of all government cover-ups afterwards.
Like Rachel, Roswell has embraced its alien-friendly status in recent years, with notable sites ranging from the International UFO Museum and Research Center to a spaceship-shaped McDonald’s restaurant. Here too, UFO tourism has kicked into hyperdrive of late and the ‘grey dollar’ (as it’s been jokingly nicknamed by some in the industry, after the most frequent visualisation of alien skin tone) is being spent as never before. Dennis Balthaser, a local man who runs extraterrestrial-themed tours in Roswell, says demand is such that he’s now running them twice daily, five days a week.
“By the end of this year I’ll have cleared 300 tours,” he tells me. “Most visitors are curious about Roswell, but have very little information on what happened here. They’ve usually seen something on TV that’s sparked their interest and they make a stop here during a longer vacation — although there’s also a smaller group who’ve had a UFO experience of their own and want to find out more.”
That dichotomy, between the curious and the firm believers, echoes the experience at Area 51. In Roswell, there’s a decided international flavour to proceedings, too.
“Several times a month I have people from the UK, China, Australia, South Africa and Japan on my tours, as well as most US states,” says Dennis. “People know that something happened here, but they’re not sure what. It’s that not knowing, that mystery, that continues to drive this. As long as we don’t know the truth, and people keep speculating about theories, they’ll keep coming to visit places like this.”
It would obviously be bad for Dennis’s buoyant business, but does he think we’ll ever get to the bottom of what really happened during that summer storm of 1947, when the US Air Force admitted they’d recovered a ‘flying disc’, before backtracking the following day and claiming it was a downed weather balloon? “I don’t anticipate disclosure in my lifetime, but I do hope it will be revealed for young people eventually,” he says. “We deserve the truth — one way or the other.”
That quest for answers remains firmly focused on US territory, where, according to the Washington state-based National UFO Reporting Center, there were 3,381 sightings in 2018 — more than three times the annual average since records began. Either more aliens are showing up, or more humans are wanting to believe — and acting on that belief.
As well as the ‘big two’ (Roswell and Area 51), other UFO hotspots in the US include Kecksburg, Pennsylvania — where a car-sized, acorn-shaped metal object covered in hieroglyphics reportedly fell to earth in a fiery blaze in 1965 — and Sedona, Arizona, which claims some of the most frequent alien sightings in the world, everything from colourful balls of light to flying saucers. Groups of tourists equipped with night-vision goggles, binoculars and telescopes gather here every evening to hunt for UFOs.
Extraterrestrial income
The USA isn’t the only country experiencing a rise in UFO tourism; Chile, Sri Lanka and Japan are also cashing in on the grey dollar by inviting tourists to investigate their own otherworldly mysteries. In 2008, Chile opened a UFO Trail, centred on the northern town of San Clemente, an ET hub that’s generated hundreds of sightings. The signposted, 19-mile path runs through the Andes above the town, linking the sites of the area’s most famous close encounters. Arguably the best way to experience it is with one of the local horse-riding operators, which carry telescopes in their saddle bags and teach you about the stars while discussing the Earth-bound craft that supposedly came from them. These extra-terrestrial sightseeing expeditions typically end with an intergalactic debate over pisco sours around a campfire.
Among the talking points, El Enladrillado will invariably loom large; this amphitheatre-like arrangement of perfectly cut volcanic stone blocks was supposedly laid by the ancients as an alien landing ground.
Sri Lanka also has its eye on extraterrestrial income, with UFO tourism focusing on ‘alien mystery tours’ around Anuradhapura, the capital city of the North Central Province, while Japan’s own UFO capital is Asuka, in Nara Prefecture. The tiny village is famed for its mysterious carved granite monoliths; the largest of which is the Rock Ship of Masuda, a 15ft-tall, 800-tonne block with a straight central ridge and two one-metre square holes cut from it.
So, where does UFO tourism go next? Operators like Nate Arizona continue to see bookings flood in — a trend which shows no sign of abating. One of Nate’s guests, Armando Martinez — a 51-year-old photographer from Denver who recently joined Nate’s Area 51 tour — tells me he absolutely loved the experience, and the images he captured on it. “The beauty of tours like this is that the places you visit are so exotic and extraordinary in their own way that they help build up the anticipation of possibly seeing the paranormal,” says Armando. “You can see that possibility right up to the security gates of Area 51, and it’s very special.
“I think paranormal tourism is growing for one simple reason — more people are believing in it,” he adds. “Improvements in technology, particularly mobile phones, means there’s far more evidence of the paranormal being collected. There’s so much documentation out there now that you have to really step back and re-evaluate things, and tours like this are great for that kind of perspective.”
Airbnb seems to agree. According to its head of Adventures, Caroline Boone, the company has been “delighted” with demand for Nate’s ‘Paranormal Tour of the US Southwest’. “Nate’s paranormal tour offers travellers an out-of-this-world immersion in a far-off location and access to a community they might not otherwise encounter,” she says.
Back in the heart of that far-off community — namely the bar at the Little A’Le’Inn — Nate is feeling equally positive. His goal, he says, is to unite Roswell, Sedona and Area 51 into a super UFO tour, spanning three states. And with backers like Airbnb, who’s to doubt him?
“There’s definitely something here; something big,” says Nate. “It sounds corny when we’re talking about flying saucers, but the sky really is the limit here.”
Five UFO tourism hotspots
1. AREA 51, NEVADA
Around 150 miles north of Las Vegas, Area 51 is part of a top-secret US military base covered by a permanent no-fly zone. Conspiracy theorists believe the area is a storage facility for crashed alien spacecraft and its occupants, something the US government has neither confirmed nor denied. Authorities actively discourage visitors from coming within a five-mile radius of the facility, but some tours will take you around the perimeter and to the two main gates.
2. ROSWELL, NEW MEXICO
In July 1947, something crashed to earth north west of Roswell during a thunderstorm. Debris was recovered by a local rancher and quickly seized by the military. An army press release initially claimed a ‘flying disc’ had been recovered — a claim that was swiftly withdrawn, with the object now explained as a downed weather balloon.
3. KECKSBURG, PENNSYLVANIA
The town of Kecksurg is home to the ‘space acorn’. On 9 December 1965, a 15ft-long, copper-coloured object covered in what looked like Egyptian hieroglyphics fell to earth in a forest here. Plenty of locals saw it but the US military quickly arrived and spirited it away. Eyewitnesses were told to forget what they saw, which naturally caused many of them to tell everybody and anybody. In 1990, a replica of the UFO was erected, which has gone on to become a tourist attraction.
4. WYCLIFFE WELL, AUSTRALIA
Self-proclaimed UFO capital of Australia, Wycliffe Well is locate in the Northern Territory, approximately 200 miles from Alice Springs. It’s said to be one of the top five UFO hotspots in the world, and for good reason — there’s a recorded sighting every couple of days, on average. Visitors can stay in cabins at the Wycliffe Well Holiday Park, where the walls are covered in newspaper clippings of UFO sightings and you’re ‘guaranteed’ one of your own if you stay for more than 48 hours.
5. M-TRIANGLE, RUSSIA
Around 600 miles east of Moscow, the area around the remote village of Molyobka, in the Beryozovsky District, is said to be Russia’s answer to Area 51. Locals have reported seeing a range of phenomena here in the foothills of the Urals, including hovering lights, strange symbols written across the sky, and even translucent beings. There are also persistent rumours of people having visited the area and subsequently developing enhanced intelligence or superhuman powers.
Two years ago, an automated telescope in Hawaii detected ‘Oumuamua, the first known object from interstellar space observed passing through our solar system. Then in August, an amateur astronomer in Crimea found a second interstellar visitor, 2I/Borisov, suggesting that such objects come our way on a regular basis.
Now, scientists are eagerly developing plans to explore these messengers from afar and to learn their secrets.
“Imagine something that’s traveled for hundreds of thousands or even millions of years through space, now reaching us,” says Andreas Hein, an aerospace engineer at the Initiative for Interstellar Studies in Charfield, England. “What will it tell us about its origin? What composition do planets have that orbit this alien sun? Does life propagate between stars?”
The path of interstellar comet 21/Borisov now passing through our solar system.NASA, ESA, J. Olmsted, F. Summers (STScI). / ESA/Hubble
For now, answers are trickling in slowly from observatories on the ground and in orbit around Earth, including an intriguing new image of Borisov just taken by the Hubble telescope. Come 2028, though, a European spacecraft called Comet Interceptor could be on its way to a brief encounter with another, as-yet-undetected interstellar object.
Hein and his colleagues have an even grander project in mind. They’ve drawn up plans for Project Lyra, a space probe that could travel fast enough to overtake either ‘Oumuamua or Borisov (or another interstellar object) as it speeds its way out of the solar system, reaching either one by the mid-2040s.
To Hein, launching Project Lyra would be akin to building humanity’s first starship — and doing it on the cheap. “We won't have the capability of reaching another star system within the next few decades at least, but having the opportunity to study a big chunk of material from another star is a bit like flying to another star,” he says. “It is a literal version of, ‘If you can't go to the mountain, let the mountain come to you’.”
Inching toward the interstellar visitors
The many mysteries surrounding ‘Oumuamua (“oh moo-uh moo-uh”) have further boosted the desire to get to see one of these interstellar visitors up close.
Researchers anticipated that the vast majority of interstellar objects would be comets, but ‘Oumuamua sure didn’t look like one. It was strangely elongated, like a half-mile-long cigar, tumbling as it went. It also displayed no comet-like tail, and it sped up slightly as it moved away from the sun. These oddities led Harvard astronomer Avi Loeb to float the controversial idea that ‘Oumuamua might not be a comet at all, but an alien spacecraft.
In contrast, Borisov seems to closely resemble the comets in our own solar system. “It appears to be of a very different nature than `Oumuamua,” Loeb says. “But when you walk down the street and notice a weird person, the fact that later on you encounter many normal people does not take away the weirdness of that first unusual person.”
Alas, the European Space Agency’s Comet Interceptor will be unable to reach either of these objects. In fact, it wasn't designed to go after an interstellar object at all. The original plan was that, after its launch in 2028, the 1-ton spacecraft would park itself in orbit around the sun, waiting for a comet to arrive from the outskirts of our own solar system. Then it would fire up its engines, making an encounter and deploying smaller probes that could come within a few hundred miles of its target.
We may be closing in on the discovery of alien life. Are we prepared?
The discovery of ‘Oumuamua and Borisov has the Comet Interceptor team reconsidering its plans. By one estimate, at any time there are about 100 interstellar objects within Jupiter’s orbit around the sun — and there’s a decent chance that at least one of them will come within range of the spacecraft.
“If an interstellar object happens to turn up with the right trajectory at the right time, it would be too good an opportunity to turn down,” says mission co-leader Colin Snodgrass, an astronomer at the University of Edinburgh.
Although Comet Interceptor’s flight past an interstellar visitor would be fast and brief, it could prove highly revealing. “It would be fascinating to see one up close,” Snodgrass says. “Either it would look like nothing we ever saw before, and would require new theories, or it would look surprisingly familiar, implying that there are some universal similarities in planetary systems.”
Hit the space accelerator
If you want to chase down ‘Oumuamua or Borisov to determine their true nature, you’ll need a spacecraft with a lot more oomph than Comet Interceptor. ‘Oumuamua is now more than 1 billion miles from Earth and speeding away from us at nearly 18 miles per second. Borisov will make its closest approach to the sun Dec. 7, and then it too will head back to interstellar space at high speed.
That’s where Project Lyra comes in. The engineers at the nonprofit Initiative for Interstellar Studies came up with this concept based on their research into technologies for advanced space travel. The team concluded that the most promising way to reach an interstellar object is with a so-called Oberth maneuver, in which a spacecraft swoops to within 2 million miles of the sun and then fires its rockets full-blast to slingshot toward its target. Using a giant rocket like NASA’s long-awaited Space Launch System, combined with solid-rocket boosters, Hein and his group calculate they could get a speed boost of about 12 miles per second, just enough to do the job.
With a 2033 launch, this scheme could deliver a small but capable probe weighing perhaps 100 pounds to ‘Oumuamua by 2048. Slowing down at the other end would be another challenge. “Maybe we can use electric or magnetic sails,” Hein suggests, referring to a giant metal web that would create drag against the magnetic field and charged particles found in deep space.
A fleet of laser sail spacecraft arriving at 'Oumuamua.Maciej Rebisz / Project Lyra
Surviving the sun’s intense heat may be an easier problem to solve. NASA’s current Parker Solar Probe, which will repeatedly swing within 4 million miles of the sun during the 2020s, is testing a carbon-composite heat shield that can effectively withstand temperatures of 2,500 degrees Fahrenheit.
Aliens closer to home
But there is another way to accelerate a mission to an interstellar object: Instead of going faster, aim closer. Loeb notes that not all of the incoming objects head back to the stars. He calculates that some might get deflected by Jupiter’s gravity and trapped into an orbit around the sun. If so, a conventional spacecraft could reach them in a matter of years.
“There are already a number of candidate objects known,” Loeb says. He cites in particular 2015 BZ509, a recently discovered asteroid that orbits near Jupiter but in the opposite direction of all the planets — a likely sign of an interstellar origin.
Loeb also proposes scouring the surface of the moon for debris left by other interstellar objects that might have crashed there over billions of years of lunar history. That’s a timely suggestion, since NASA’s Artemis program could send astronauts back to the moon as early as 2024.