World War A - When Aliens Attack | Full Science Documentary

For thousands of years, humanity has questioned the existence of extraterrestrial life in our universe. Sooner or later we will see some kind of signs of extraterrestrial life. We need to prepare. The chances of

aliens

existing in some form are very likely. It is very likely that there is intelligent life somewhere in the universe. Today, astronomers are already sending messages into space. But what if these messages are perceived as threats and the

aliens

believe that humans are the enemy? If they came as conquerors, it could be the end of planet Earth as we know it. Is an invasion inevitable?

This is an alien

attack

! It would be like Godzilla meeting Bambi. I think there is almost a 100% chance that there are extraterrestrial life forms in the universe besides our own. If aliens existed, they would come from the farthest reaches of the universe. Their huge spaceships may already be on their way to our

world

. And there is no way to know

when

they will arrive. Many think this scenario is possible, including researcher Nick Pope, who has worked with the British Ministry of Defense to investigate UFO sightings. There is no reason why intelligent aliens couldn't have already begun their journey.

It could be a year from now, it could be a month, it could be a week, it could be later today. There is no way to determine whether they would come peace

full

y or what their intentions would be. Extraterrestrial contact with our planet would change life as we know it. Oh! Nothing would be the same again. The arrival of extraterrestrials could mean the extinction of the human race. It's impossible to know exactly what would happen, but scientist Ben Moore believes it comes down to two basic principles. If extraterrestrial life came here, it would come because they were curious or because they weren't friendly.

Our Earth is just a simple particle in a massive universe. Statistically, scientists believe this must mean that millions of other civilizations like ours could exist. The Earth orbits the Sun, as do seven other planets. But our Sun is not unique. It is just one of more than 100 billion bright stars in our Milky Way galaxy. And even the Milky Way is just one of a trillion other galaxies. The universe is a very big place and if we are talking on the order of a billion galaxies, each with half a billion stars, it seems like a pretty silly idea to imagine that we are alone in the cosmos.

Some scientists believe it is only a matter of time before aliens finally arrive on Earth. Perhaps they are more united than ever. Oh! The most incredible guy on Earth. Beer! If there is life, intelligent life, and other civilizations in our small part of the galaxy, we will find them in just a half-dozen years or so. Is there life in space? The answer could lie in Earth's closest neighbor, the planet Mars. Located more than 34 million miles from Earth, researchers speculate that Mars is a planet that could host extraterrestrial life. In this infinite universe, the same chemical processes that gave rise to life have most likely arisen many, many times elsewhere.

One place we could find life is within our own solar system. There are suggestions, for example, that there is microbial life on Mars. In 2003, ESA sent the Mars Express probe to the red planet. Their mission is to find water, the basic substance of life on Earth. The Mars Camera images showed something remarkable: deep valleys running through the rock of Mars. At some point water must have flowed through here. And in some craters on Mars, scientists have found frozen water. There are even entire glaciers covering the poles of Mars, but that's not all. We see images of river beds.

Even the image of an ocean. So we know that Mars was once tropical, it was once lush. Scientists have been able to trace the entire history of Mars. Four billion years ago, a gigantic sea covered a third of the planet. This water would have been sufficient to sustain the microorganisms. Except suddenly the weather changed. For some reason, Mars lost its atmosphere and cooled down. And the water evaporated or froze within the soil surface. It is possible that it had life in the past. But if there is still a small amount of liquid water left, there is still hope for life on Mars.

A recent promising sign: strange grooves on the slopes of Mars. These features can occur

when

water liquefies in soil and rock slides over it. Hidden beneath the arid surface of this planet, there could still be liquid water, water that could mean life. Except on Mars, temperatures can drop to -121 degrees Fahrenheit. Without atmospheric protection, dangerous cosmic rays can directly hit the planet's surface. Is it even possible for life to survive in these conditions? Discovering extraterrestrial life, discovering that we are not alone in the cosmos, would be one of the greatest discoveries, if not the greatest, of all time.

Extraterrestrial arrival would be a sudden and shocking event. Nobody would be prepared. Our vulnerable planet could be

attack

ed by hostile invaders. If there were an alien spacecraft entering our solar system, we may only have a few days or weeks' warning. They are very difficult to see. To answer the age-old question about life on Mars, scientists are taking a deeper look at a continent on Earth that mimics Mars' icy climate: Antarctica. Researchers at the German Aerospace Center are looking for Extremophile organisms, microorganisms that can withstand the most severe cold. They find cyanobacteria, microfungi and lichens, tiny creatures that can still survive temperatures as low as negative 58 degrees.

These extremist organisms clearly show us that life can exist in the most incredible places. We find life in the most extreme places on our planet. So why shouldn't organisms also exist on Mars, which is also a frozen desert? In his Berlin laboratory, Jean-Pierre de Vera must test whether these Antarctic organisms can cope with even more extreme conditions. He has designed a special Mars simulation chamber to test mosses and bacteria. This is our Mars camera. We have brought it as close as possible to the condition of Mars. These temperatures are extremely low, from -58 to -103 degrees Fahrenheit.

To match Mars' thin atmosphere, the pressure is reduced to six millibars. Earth's air contains less than 1% carbon dioxide. The air in this chamber is almost 96% carbon dioxide. Under these conditions, most land creatures would immediately perish. But the extreme-loving organisms of Antarctica survive. So far, what I have discovered in the Mars chamber has been very surprising. Even under Mars conditions, fungi could form proteins and bacteria still produced methane. These algae and lichens could still photosynthesize even under Mars conditions. For this reason we want to take the next step. We need to do these same tests in space.

To assist with this study, the International Space Station must spring into action for this unique experiment. With a risky outdoor installation, the astronauts set up an experimental laboratory on the outer surface of the space station. Several hundred samples, including bacteria, fungi and mosses, will be exposed to cosmic radiation and orbit the Earth for more than a year. If these organisms could survive in space, they may have also managed to survive on Mars. Life may exist on Mars. Based on the experiments we have performed, it is clear that today's Mars is a viable planet. I think we should seriously look for life on Mars.

Demonstrating that simple life exists on Mars would greatly fuel the broader debate about intelligent life. Ours will be the generation that makes this literally revolutionary discovery, one that alters everything we know about ourselves and our place in the cosmos. But others in the cosmos may be trying to find our

world

. There is no way to anticipate where they would land. His arrival would surprise humans. Are they friendly or not? Who knows? I hope they are friendly and that the first contact is friendly. Humans need to find evidence of extraterrestrial existence before making contact. March 14, 2016. At the Russian Baikonur Space Station they launch another new project to learn even more about Mars.

ExoMars is a joint project of the European Space Agency, ESA, and the Russian Space Agency, Roskosmos. The mission is monitored through ESA's control center in Darmstadt. Flight director Michel Denis makes sure the probe stays on course. ExoMar's mission is to find traces of life on Mars. That could be the life that used to exist or maybe even still exists today. Since methane on Earth is mainly produced by living things, the Trace Gas Orbiter is designed to detect methane and then find the source of the gas. Methane on Mars could be generated by volcanoes. We believe those volcanoes are now extinct.

So it could be produced by minerals or it could be created by living organisms. In the next phase of the mission, a rover will land on Mars. Since cosmic radiation makes the surface itself too hostile for life forms... the rover will search for life on the ground. Protected from lethal radiation below the surface, the microbes could still be alive. This is the first time in history that a Mars rover will drill two meters deep into the planet. The deeper we go, the further we can go back in history, increasing the chances that we will find life.

Soil samples are examined immediately on site. A special set of instruments aboard the rover analyzes drill cores for traces of life. But even after all this effort, there is still a chance that Mars is actually a dead planet. There are still other potentially habitable worlds. The two moons orbiting Saturn, Titan and Enceladus, could support life in the ice that covers them. The gas giant Jupiter also has its own ice moons: Ganymede and Europa. Beneath their ice crusts, they may have oceans of liquid salt water that could be teeming with life. Our next hot candidates are still in our solar system.

We definitely want to look for life on ice moons. One of these moons is very active and we can say that it is expelling oceanic material. That's exactly what we want to see. If something comes out of the ocean, there could be life in that material. Future missions could finally reveal whether there is life in our solar system. Unless highly developed aliens discover us first. Scientists believe they could reach our planet. A species that had evolved a million years longer than us would certainly have the ability to send a spacecraft here. Could these visitors be dangerous?

What would such an advanced species want from us? If aliens decided to conquer our Earth, would we have a chance? Look at it! Look at it! -Look what? -Behind you! If they came as conquerors, it could be the end of planet Earth as we know it. If aliens arrive, they will have traveled a great distance, from a planet that is very far from our solar system. How do we identify where they will come from? A man is getting closer to the answer. Swiss astronomer Michel Mayor heads to an observatory in France. It was here, in 1995, that he made a revolutionary discovery.

We have come to the Haute Provence Observatory to measure as many stars as possible in the clear sky. In just his first week, Mayor was able to identify 142 stars and there was something very peculiar about one of them. The star 51 Pegasi seemed to move, a strange little wobble that made him think it might have a planet in its orbit. Looking at them from Earth, most stars appear to have a constant, uniform velocity. But we've noticed that 51 Pegasi actually changed its speed in a very specific way. Mayor has a theory: the gravitational pull of this star is holding a planet.

But the planet itself is receding, causing the star to also make a small movement. Astronomers call this a "change in radial velocity," which causes a change in the way light from the star reaches us on Earth. As it progresses, it looks bluish. As it recedes, red is perceived. Mayor checks these small deviations in the light spectrum with his spectrograph. The mayor is positive, 51 pegasi must have a planet. This was our proof that there was a planet orbiting the star. For the first time in history, an exoplanet has been identified. A planet outside our solar system. The newly discovered planet is located in the Pegasus constellation, 50 light years from Earth and has been given a name, 51 Pegasi b.

This was the first time we found a star, besides our Sun, that actually has a planet. The discovery of 51 Pegasi b is a major milestone in space exploration. We now know with certainty that exoplanets exist outside our systemsolar. The discovery is also another reason why many scientists are convinced that extraterrestrials exist, including well-known theoretical physicist Michio Kaku. I think the probability of us finding intelligent life in the universe is close to 100%. Does any planet have the potential to support not only simple life forms, but also the development of entire civilizations? Could there be a second Earth?

Is there a planet with the same characteristics as ours? Three two. The engines start. One, zero and takeoff of the Delta II rocket with Kepler. In 2009 the Kepler telescope was launched into space. The main task of the telescope is to fly through space in search of new exoplanets. Kepler has detected more than 2,000 exoplanets and the telescope continues to make new discoveries every day. The Kepler satellite has provided us with a census of the Milky Way. We know that between 50 and 100% of the stars we see at night have planets around them. And so, I think the chances of us being the only planet with intelligent life are very close to zero.

To date, almost 4,000 exoplanets have been discovered. Like Corot 7b. At 490 light years away, this planet is probably made up mostly of hot lava. At first glance, planet HD 189733b actually looks like Earth. But its blue color is due to another reason: it is not water, but dangerous glass particles in the atmosphere. With brutal winds of 5,000 miles per hour, it could even rain molten glass on this planet. 55 CancriIn fact, it is possible that we possess a diamond core. The surface is a scorching 3,600 degrees Fahrenheit and this exoplanet's atmosphere contains large amounts of a toxic prussic acid. Life as we know it on Earth could not exist here.

I think a shadow Earth or Earth 2.0, that's what we'll see. The alien invaders may come from a place much like a second Earth. So why should they come to ours? If they really came to wage war, humans would have no hope. Military experts believe that facing aliens in combat would be devastating. If an alien civilization has the ability to cross interstellar space to reach Earth, it certainly has advanced technology. If their civilizations are more advanced than ours, how can we prepare for contact? Another scientist is also scouring the skies in search of a planet where life is possible.

Heike Rauer is an astrophysicist at the German Aerospace Center. The great objective we have is to find planets similar to our Earth. Habitable where we could find life. Heike Rauer knows that the key is to find planets with a solid surface and water, the two attributes that seem to go hand in hand with the existence of intelligent life. If you brought the Earth closer to the Sun, it would get hotter. Some of our oceans would evaporate, and then we would have a planet that would not be habitable, and if you moved the Earth further away from the Sun, it would be so cold that the water would freeze and we would just have an ice planet.

Our planet would not be habitable then either. So there is a specific ideal distance from the Sun. We call this zone the "habitable zone." This habitable zone is the only place where life can develop. But for that to happen, the planet also needs an atmosphere... like the thin layer of gas, which also surrounds our Earth, protecting life from the deadly ultraviolet radiation emanating from stars, including our own Sun. Of course, The atmosphere is also crucial, because we breathe and we need the oxygen in our atmosphere to live. Therefore, a planet must also have the right type of atmosphere.

Use a trick to quickly find habitable planets. Every time a planet passes close to its star, at that precise moment the star dims slightly. Using this strategy, researchers like Heike Rauer have already detected more than 30 planets in the habitable zone that could be

full

of life. One planet seems particularly promising to researchers: Kepler 452b, a planet 1,400 light-years away in the constellation Cygnus. This planet is strikingly similar to Earth. Its star has a size and temperature similar to our Sun. A round trip around the star takes 385 days, a little longer than the orbit of our Earth. And the distance to the star is correct.

We are getting closer to finding a world very similar to ours. I think now it's just a matter of time and I think it could be amazingly close. A new European telescope has the means to finally find this second Earth. This advanced device is called the European Extremely Large Telescope, E-ELT for short. In 2024, the telescope will be stationed in the Chilean desert. It will be the largest of its kind in the world. In the assembly hall of the European Southern Observatory, technicians test the pieces that will later become the telescope's main mirror. So what we have here is the first prototype of the ELT primary mirror.

That is why we need a very large mirror that today is impossible to build in a monolithic piece. Nearly 800 individual hexagonal mirrors will be assembled to create the telescope's massive 40-meter mirror. So far we have built telescopes between eight and ten meters. But now we have the technology to build something extremely big. 40 meters in diameter it is almost as big as the Allianz Arena and it is huge. Scientists hope the power of the telescope will finally prove that there is life on an exoplanet. They want to use the telescope to examine the planet's atmosphere. As soon as the planet moves in front of its star, scientists can determine by color what type of molecules it contains.

The ultimate test is to identify some specific markers, some ozone, for example, some specific elements in the atmosphere of this planet that can only be produced by life. By plants, by small creatures in... in the ecosystem. With the new telescope, researchers aim to find evidence of life within the next 30 years. So it's definitely in our life. So in the next decade, with the E-ELT we will be able to really understand whether there is life, potential life or not. Is it possible that aliens are already observing us too? Are you planning a visit and for what purpose?

Sooner or later we will see some kind of signs of extraterrestrial life. We need to prepare. An extraterrestrial attack would be the greatest catastrophe in human history. Is life out there like on Earth? It probably shares some of those characteristics that life on Earth has. Is there any way to predict what the invaders will be like? Some researchers believe that aliens could be very similar to us. I think there is a strong possibility that some aliens look exactly like us. So, for example, the eyes are very useful. The legs are very useful for mobility. Those things may be present in other parts of the universe.

Therefore, I would not rule out that some extraterrestrials are indistinguishable from human beings. Different environmental conditions could mean that life on other planets would be drastically different. These organisms would need to withstand extreme heat or cold. If they came from a planet with stronger gravitational forces, the aliens could have adapted and developed massive muscles to fight the pull of gravity. Small, compact creatures would have an advantage on this type of planet. Or on a planet with less gravity, the aliens would need much less muscle to move. Your planet could be populated by skinny giants. All life on Earth is made of carbon and water, but on another world life may have evolved from completely different chemical elements.

On Saturn's moon, for example, there may be no liquid water, but there are still other building blocks that could combine to form life. So Titan's creatures could use ethane or methane as a liquid instead of water. So the basic component would probably be silicon instead of carbon. And those creatures could breathe hydrogen instead of oxygen. So life could be very strange in that world. There is also the possibility that the visitors are not actually alive. Aliens could potentially send their own intelligent machines into space. When we meet them in person, they may already have bioengineering and artificial intelligence.

So don't be surprised to find out that they are part robotic and part biological. Many scientists think it is entirely plausible that aliens have developed advanced spacecraft capable of reaching Earth. Yes, it is perfectly possible to undertake interstellar travel. It simply takes a lot of effort and a lot of money to develop such a spacecraft. A journey through the stars is now within our reach. Russian millionaire Yuri Milner has invested $100 million in the Breakthrough Initiatives project in the United States. And others are on board, including astronaut Frank Drake and even star physicist Stephen Hawking. It's time to commit to finding the answer to searching for life beyond Earth.

It is important for us to know if we are alone in the darkness. The plan is to visit our neighboring star system, Alpha Centauri, just 4.2 light years from Earth. Scientists have discovered that in this system the red dwarf star Proxima Centauri is orbited by an Earth-like planet. Proxima b is perfectly in the habitable zone, making the planet an ideal candidate to host extraterrestrial life. But an unmanned probe would take 32,000 years to reach Proxima b. Milner and Hawking believe we need a miniprobe that can make the trip in just 20 years. If the probe weighed only a few grams, it could be equipped with a sail.

Extremely powerful lasers from Earth would then be pointed at the sail and in just ten minutes the probe would be propelled by the lasers to a quarter of the speed of light. For the first time in human history we can do more than just look at the stars: we can reach them. Traveling at a speed of 46,000 miles per second, the ultralight spacecraft would only take 20 years to reach Alpha Centauri. If sentient life is based on expansion and exploration, then it is very likely that other sentient species are also participating in interstellar exploration. Advanced civilizations could have developed completely different technology.

Some researchers believe that more progressive aliens can harness the energy of entire stars to create wormholes that they then use to travel through space and time. We've gone from horse and cart to stealth fighter and rocket ship in 200 years. Now let's imagine a civilization with a million-year head start, something that is not difficult to conceive in a 14 billion year old universe. So let's not discount the fact that if there are civilizations out there, they can knock on our door. The invasion of a high-tech civilization represents a serious threat to the human race. In an attack, we would barely have a chance.

Humans would need to find shelter and safety as soon as possible. If this crisis were to come to fruition, everyone would be caught off guard. I think it is important to consider the possibility of interstellar species approaching Earth that could be hostile and to consider what resources we might have at our disposal to allow us to defend ourselves. And time may be running out. The aliens may already be heading toward their goal: Earth. But some alien hunters are more optimistic. One of the most famous hunters believes that the aliens will be peaceful. Seth Shostak has dedicated 50 years of his life to SETI research, the search for extraterrestrial intelligence.

The American astronomer is convinced that his work will bear fruit. There are a trillion, that is, a million million, planets in our galaxy alone. It's like you bought a billion lottery tickets. You know, a couple of them will be winners. That's why it seems inevitable to me that there is other intelligent life out there. Someday we will be able to communicate with extraterrestrial civilizations. But are they already trying to contact us? To find out, SETI researchers use radio telescopes, such as the Allen Telescope Array in California. These telescopes can receive radio acoustic signals from the depths of the universe.

We point them in the direction of nearby stars, which we think could have planets, which could have life, which could have intelligent life. And we simply look for signals that come from those directions. Signs that at one point on the radio dial told us: "Hey! You know, I don't know what they say, I don't know what they look like, but they've built a radio transmitter." And once upon a time there was a sign like this that came to Earth. In 1977, the Big Ear radio telescope at Ohio State University pointed its antennas directly into space. With these antennas, the telescope could capture all the radio waves found in its orbit.

And suddenly he received a strange signal from space. Astrophysicist Jerry Ehman was working on the Big TelescopeEar. She could hardly believe it when she analyzed the recorded data. In those days, all the data was simply printed out as numbers on a large printer and he would just go through it and see if there was anything interesting that had happened the night before. One morning, he finds a big sign and gets so excited that he writes "Wow!" together with him. This "wow!" The signal came from the constellation Sagittarius, 200 light years from Earth. With a standard deviation of 30 times, the signal was strong enough to be heard above the background noise of the universe, and it is possible that it was sent by another civilization.

But the "wow!" The signal was never detected again. To this day, it is unclear if it is the result of something natural or if it was caused by something else. If aliens send us signals, what would happen if they visited us personally? People would respond in many, many different ways. Some people would literally panic in the streets. Okay, no one knows what's going on. People are scared... Hey! Chaos and violence would hit the cities of Earth. Or the world as we know it would collapse. There's someone here. Come on. -Is dead? -Let's get out of here.

Just go! Fear, shock, panic, anger. Humans are very likely to be terrified. At the SETI Institute in California, Seth Shostak and his colleagues continue to search for recent signals. Astronomers evaluate data from radio telescopes around the world. To date, they have not found any evidence to prove that extraterrestrials exist. For this reason, many scientists criticize SETI's search methods. We look for radio signals from intelligent planets, but that's looking at the wrong frequency. Why should they use old radio to communicate? The alien hunters have not given up. To finally get in touch with extraterrestrials, some SETI researchers believe we should play a more active role in communication.

Instead of listening to distant signals, our own messages should be sent into space. If you send to some nearby stars that are not far away (ten light years, 20 light years), then maybe you will get a response while you are still alive and can enjoy it. It wouldn't be the first time that astronomers have sent a message to extraterrestrials. In 1977, the Voyager 1 probe reached space. Since then, it has reliably sent back data and images of our solar system. Valuable cargo is stored on board. The "golden record": a copper record containing music, images and sounds of the Earth.

Greetings recorded in 55 different languages. A way to kindly introduce ourselves to foreign civilizations. Hello from the children of planet Earth. Herzliche Grüße an alle. Good day for everybody. Kon'nichiwa? Ogenkidesuka? Hello and greetings to all. In 2012, Voyager 1 became the first probe to leave our solar system. It has flown further into space than any man-made object ever seen. This cosmic message in a bottle will travel even deeper into interstellar space. By 2025, the probe will run out of power and continue into the cosmos, uncontrolled. Will aliens ever find these spaceships? I do not think. They're about the size of a Volkswagen Beetle, right, and they're dark and their transmitters won't work at that time.

So how are you going to find these guys? It's like searching for, I don't know, some flotsam in the Pacific Ocean. You'll probably never find it! Acoustic signals are already being sent into space. The most famous signal was the Arecibo Message in 1974. The message created by astronomer Frank Drake used binary code to provide information about human biology, the Earth's population, and tell the recipient exactly where the signal originated. So far we have not received a response from the extraterrestrials. Seth Shostak believes we should think big. In fact, he wants to offer big data to aliens. The more information they receive, the better they will understand us.

In fact, it would send the Internet. I would just send everything over the Internet. I mean, if you walk to the beach and find a message in a bottle and it's a phrase, you may never find out what that message is about. But if it were a thousand books, you might discover many more. But others think these well-intentioned messages would make us incalculably more vulnerable. Enemy aliens could take advantage of these communication efforts to mount a large-scale attack. I think it's a pretty silly idea to send powerful luminous messages indicating our presence. Who knows what is in our galaxy?

It's like being four years old in the middle of a dark forest. Does he explore and learn the situation, or does he run screaming through the forest saying, "Monsters, hello! Everyone, I'm here"? Critics say stopping these messages is the only way to avoid a human catastrophe. Before we continue, there needs to be more scientific discourse about what these messages should contain and who can send them. I think we should have debates, serious scientific investigations and debates about the pros and cons before sending messages into space. The first projects, such as that of Yuri Milner, are already underway.

For the best message that can be sent to aliens, a $1 million reward is at stake. Although he also previously warned against sending messages, Stephen Hawking now supports the initiative. It is time to open our eyes, our ears and our minds to the cosmos. If the aliens received our signals a long time ago, now it is too late to hide. Any society that can do that, any society that can come here and threaten them, has antennas bigger than us, they can already pick up our television, our airport radars, all kinds of things, so we are already telling them they are here.

Pandora's Box may already be open. At this very moment, aliens could be on their way to Earth. If there are more intelligent, more powerful and therefore more dangerous civilizations, we should be very careful when contacting them. These fears are not unfounded. In the history of humanity, when a new country or continent is discovered, it has always ended tragically for those who are conquered. The less technologically advanced culture experienced pain, in some cases death and extinction, in other cases slavery. An invasion by militant aliens could wipe out the human species. If the battle starts, those who could hide in time would be the only survivors.

The aliens would need a reason to fight Earth. It is possible to conceive of other civilizations that are at war in the cosmos and that are perhaps desperate for new territories or new resources. Maybe they'll look at the Earth and say, "This could be our new home." Would a universal war with extraterrestrial life be plausible solely for our resources? With so many planets orbiting stars that will have water, carbon and all the elements that are on Earth, there is no reason to come to a planet full of life. This is an alien attack! Our planet is home to seven billion people.

For aliens, Earth's most interesting resources might actually be its inhabitants. - -Run! If they are bellicose, it would be like Godzilla meeting Bambi. There would be no competition. Is there any way to prepare for this type of disaster? Space agencies have emergency procedures to respond to hazards such as meteorite impacts. Do you also have a plan in case of an alien attack? Scientists and military experts have already thought about what would actually happen in an attack situation. An alien civilization approaching Earth as a potential target for conquest will first attempt to eliminate any resistance. The simplest thing they can do to neutralize our weapons is to use the electromagnetic pulse.

Without warning, all power supplies would be cut off. Electronic devices, cars and phones would be useless and humans would suddenly be powerless. Basically, we would take human civilization back to the 19th century. Earth's largest cities would be the first target of an invasion and most would not survive the brutal war. I'm sure many of Earth's nations would use nuclear weapons, even on their own soil, as a last resort to try to stop some form of alien invasion. The use of weapons of mass destruction would destroy our own planet. Luckily, there is also another strategy. In reality, the first objective would simply be survival.

The second priority would be the capture of enemy technology. And by reverse engineering, we may be able to produce them in significant quantities. Even if the aliens haven't planned a deadly invasion, it could still turn into a war if we get in their way. Even if the aliens don't want to conquer us, even if the aliens don't want to eat us, even if the aliens don't want to plunder our natural resources, we might stand in the way because they might have other intentions. towards us. Humans would have no way to escape. We still don't know what's happening.

We have hidden underground. If an enemy arrives that has such a huge disparity in its technological capabilities that you have no means to defend yourself, then perhaps your best chance for survival is to accept the changing nature of your civilization. If they came here with friendship, as explorers, great. We ourselves would extend the hand of friendship. If they came as conquerors, I think we would simply have to surrender. This would be a war we could not win. Only one thing is certain: the arrival of aliens would change our world forever. The only hope is that if they come, they will do so in peace.