AL: A very good approach, to probe a large region of space, is to release many small probes — like a dandelion seeding its environment. If you have a probe visiting the habitable zone of a star like the Sun, the probe itself might be too big and move too fast to land on a particular planet. If you want to probe a lot of regions and a lot of planets, you might just spread dandelion seeds. In fact, just this year, we founded a new space corporation with my colleague, Dr Frank Laukien, that aims to use this approach for the Moon and Mars, instead of the traditional approach of using just one big probe and visiting one location.
FR: How do they propel themselves?
AL: It depends on the nature of the engine. The only type of engine that we employ so far for interstellar probes are chemical rockets that can push a probe up to about a thousandth of the speed of light. But there could be much better schemes. For example, a very distinguished British cosmologist named Hermann Bondi wrote a paper in 1957, suggesting that if you have a negative mass — we are used to positive masses, but a negative mass in principle is possible to construct — then the negative mass will push away, if you put the positive mass next to it. And the positive mass will pull the negative mass with it. So together, they would accelerate indefinitely up to the speed of light. That is a type of engine that we have never constructed, and could potentially be engineered, if we developed the physics behind it.
FR: So should we assume that an alien species could have far more sophisticated technology than we do?
AL: Yes, and the way I think of it, it’s just like going on a date. You can learn from the other person. We should look at it as an opportunity; we shouldn’t be fearful of it. We are probably not sophisticated enough to be a threat to whatever comes to visit us. But we can make money from it — if we learn how to replicate [the technology] here on Earth. We can get a leap into our future.
As for what they might be hoping to accomplish — if you stay on your planet, then you might be annihilated or destroyed by a single-point catastrophe — we will not know until we observe them. I don’t think it makes sense to establish a committee of experts, and decide what the protocol is for responding to visitors. We should just try and figure out what they’re seeking. I spoke to Henry Kissinger just last year, and I asked him — because he negotiated with other nations, where the culture is very different — what is the realpolitik of interstellar communication? And he said that first you want to learn what the other side is seeking, and only then develop a dialogue with them.
FR: Is there any evidence from observatories or telescopes that these probes are actually entering our solar system?
AL: The Government collects data as a result of national security concerns and the sensors the government is using are classified. If there is high-quality data, it’s not being released to the public. But an extraterrestrial technological object has nothing to do with national security. It doesn’t adhere to national borders, and therefore any knowledge about it should be shared by all humans. It shouldn’t be the privilege of the President of the United States. We know that we are not at the centre of the universe; we know that there are billions of other Earth-Sun systems in the Milky Way galaxy alone. We are not at the centre of the stage, and we just came to the cosmic play at the end ,over the past few million years. The play is not about us.
FR: Tell me what it’s like being an expert in aliens. It must be quite an odd field to choose as your specialism.
AL: The way to think of me is as a farm boy. I’m connected to nature more than people. I have no social media. I don’t care how many likes I get. I’m just trying to do what sounds like common sense — something today which is not that common (especially in academia). There are many of my colleagues working on extra dimensions of the multiverse who do fancy mathematics — and it’s their way of showing off that they are smart. But if there is an object from another civilisation that could change the future of humanity, it may not take fancy maths to realise that it’s not a rock. When there is data about something unusual, we’re supposed to be curious. There is uncertainty. You can be wrong. That’s part of the job description.
FR: What if you are a young junior professor, at a university like Harvard, when stepping outside the bounds of what’s considered acceptable science is too risky?
AL: If you look at the career of Pablo Picasso, you will find that early on, he was a realist. He tried to draw in the style of traditional painting. After he mastered that, he invented cubism, which was disruptive. So as a young scientist, you don’t want to disrupt the system. You want to learn first of all the basic principles of physics, and apply them along the themes that are defined by senior people in academia, so that you can get a postdoc position after your PhD. Eventually you’re promoted to tenure.
But what happens after people get tenure is they are even more obsessed with their ego. They want to get honours, awards — to be recognised by their peers — and they conform to the beaten path. I say that the road not taken is the most interesting thing to take, because it may have low-hanging fruit. So I advise young scholars: if you’re interested in innovation, once you get tenure, start to be creative: innovate, because that’s the whole purpose of academia. Betray the slogan of the Party in George Orwell’s 1984, “ignorance is strength”. That’s what academia should be about.
But unfortunately, it’s not. I heard, a few days ago, a very distinguished scientist, who said: “I don’t really want to know whether Covid-19 came from a lab leak, or the wet market in Wuhan.” Why would he say that? Because he doesn’t want the image of science to be tarnished, if it came from a lab leak. This is similar to arguing that “ignorance is strength”. Knowledge is strength, and the same is true about the nature of unidentified aerial phenomena, the nature of dark matter. Everything should be driven by our ambition to be knowledgeable, because then we can adapt even if reality doesn’t look as pretty as it should be. Let us see it.
FR: There is a genuine cohort of your colleagues who would say that there is 0% probability that aliens do exist. What do you think the probability is of life beyond Earth?
AL: Galileo was placed under house arrest just for suggesting that maybe the Earth moves around the Sun, and today he would have been cancelled on social media. If you were to ask those theologians, they would say there is zero probability that the Earth is not at the centre of the universe. Now, why would they say that? Because the church wanted to control people. There are always ulterior motives. I bet you that if we find a piece of technological equipment from another civilisation, people will say: “Of course, this was talked about for decades. There is nothing really new — we knew it all along.”
But if I had to guess, I would say not only that we are not alone, but that there were many technological civilisations before us that reached greater heights. We are probably not even close to the top half of their advances. They would have technologies that look like magic to us — like miracles in religious texts. It’s possible that that civilisation could create life in its laboratories. It would bring the concept of God, or something very capable, into reality — it will unify science and religion in some sense. I think it’s very likely that they were out there billions of years ago, maybe not right now. But they existed, and the only question is, when will we find the conclusive evidence beyond any doubt? And for that, we need to search. If there are objects of technological origin, we will find them.
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This transcript has been lightly edited.
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