Buzz
A starry expanse on a warm summer evening is a breathtaking sight to witness. We often find ourselves captivated by the wonders of space—how it might offer solutions to save our planet, how we could make contact with extraterrestrial life, and how we could uncover the countless natural wonders that remain beyond our grasp.
Yet, lurking behind the dazzling stars are some of the most perilous forces we've ever encountered as a species. From fiery gas giants to catastrophic bursts of lethal radiation, here are 10 chilling ways that space could obliterate civilization as we know it.
10. Asteroid
Daily, Earth endures the onslaught of space debris, ranging from dust to rocks. Fortunately for us, most of it disintegrates upon entering the atmosphere. Sadly, for the dinosaurs, every few million years, an asteroid the size of a small town strikes the Earth.
Around 66 million years ago, a massive 10-kilometer-long (6 mi) asteroid collided with the Earth’s surface, creating a colossal 177-kilometer (110 mi) crater that triggered severe climate changes. It wiped out species that had thrived on Earth for more than 170 million years.
Although the chances of an asteroid wiping out the entire planet are slim, NASA scientists believe that any asteroid longer than 2 kilometers (1.2 mi) could bring catastrophic consequences for civilization.
Enter 4179 Toutatis. This 5.4-kilometer (3.4 mi) asteroid passes by multiple planets, including Earth, on a regular basis. While the likelihood of a collision is extremely low, its unpredictable orbit makes it impossible to forecast its flight path. Earth’s next close encounter with Toutatis is expected in 2069, so let’s hope NASA’s Planetary Defense Coordination Office is ready for it.
9. Gamma-Ray Burst
As the name implies, gamma-ray bursts are intensely powerful bursts of lethal gamma radiation. Their exact origin remains unclear, but they are believed to be caused by the collision of neutron stars or black holes.
Typically, a star releases energy in various forms. However, during the collision of two neutron stars, their magnetic fields merge, resulting in the release of massive amounts of energy concentrated into focused beams of gamma radiation. This energy release can be so immense that it generates a flash of light visible halfway across the universe, even from Earth.
So, just how dangerous are gamma-ray bursts?
Well, that depends on their distance from us and whether we’re in their direct path. Most gamma-ray bursts are harmless by the time they reach Earth. However, scientists estimate that a gamma-ray burst occurs once every five million years that could be powerful enough to impact Earth. It might even destroy our ozone layer and lead to the extinction of life on Earth!
8. Solar Storm
Imagine waking up tomorrow to find that all power is out, and there’s no way to restore it. The entire grid has failed, and it could take days, months, or even years to fix it. As improbable as it sounds, it’s actually a very real possibility.
A solar storm refers to any eruption on the Sun’s surface. These events typically don’t affect Earth. However, on occasion, they release such immense magnetic energy that it travels from the Sun’s magnetic field to our planet. This phenomenon, known as a coronal mass ejection (CME), can lead to unusual occurrences, particularly electrical surges and widespread blackouts.
For instance, the massive solar storm of 1859, known as the Carrington Event, did just that. It surged through power lines, shocking telephone operators and even igniting telegraph paper.
Though the damage back then was minimal, physicist Patricia Reiff suggests that if a similar storm occurred today, it would have “tremendous consequences” on modern infrastructure. It could potentially plunge entire continents into darkness.
7. Colliding Galaxies
While many events on this list are uncertain, this one is definitely going to happen. The Andromeda galaxy is speeding through space at a rate of 110 kilometers per second (68 mps). In approximately four billion years, it will collide with our Milky Way, leaving behind a trail of gas and star remnants.
Some stars will be obliterated in the collision, while others will be ejected from their galaxies entirely. The tumultuous interaction between the two galaxies, being torn apart and then pulled back together, will culminate in the formation of a supermassive black hole at their center, followed by the creation of a whole new galaxy.
6. Shifting Magnetic Fields
Earth’s molten iron core generates a powerful magnetic field that plays an essential role in how species navigate and shields us from the Sun’s harmful radiation.
Every 200,000 to 300,000 years, the poles undergo a shift, reversing Earth’s magnetic field. What we now call the magnetic North Pole turns into the magnetic South Pole. Given that it’s been 800,000 years since the last magnetic reversal, we’re long overdue for another one.
Sadly, this flip doesn’t happen overnight. The process is incredibly slow, taking up to 10,000 years to fully unfold. During this period, the magnetic field shifts across the planet, creating temporary smaller poles and gradually weakening the overall strength of the field.
This leaves Earth vulnerable to dangerous, DNA-damaging radiation. If the magnetic field were to disappear entirely, the results could be catastrophic.
5. Alien Invasion
What evidence currently exists of an alien invasion? Reports of unidentified spacecraft in the Baltic Sea, personal stories of alien abductions, and statements from former Canadian defense minister Paul Hellyer, who claims that at least four alien species are living among us.
The debate about the existence of aliens is still ongoing. However, with the understanding that most stars have their own planetary systems, those systems are part of galaxies, and there may be as many as 200 billion galaxies in the universe, it seems almost implausible to think that we are the only intelligent beings in existence.
Prominent scientists, including Stephen Hawking, believe that extraterrestrial life is real. Indeed, there has been a concerted effort in the past five years to establish contact with such life forms.
However, Hawking warns about the potential dangers of reaching out to an unknown civilization: “A civilization receiving one of our messages could be billions of years ahead of us and far more advanced. They may not view us as any more significant than we view bacteria.”
If history has taught us anything, it’s that those who are less technologically advanced often suffer the most during times of war.
4. Solar Expansion
At the heart of our solar system lies a fascinating star. It’s close enough to keep the oceans from freezing but far enough away to prevent them from boiling and turning our planet into a desert.
Though this star is quite extraordinary to us, it is, in fact, a typical yellow dwarf star in the stable phase of its life. During this stage, hydrogen atoms at its core fuse into helium, generating the solar radiation that illuminates and warms our world.
Unfortunately, as with all things, this phase will eventually end. At around 4.5 billion years old, our Sun has only about half of its hydrogen remaining.
As the Sun depletes its fuel, its core contracts, causing the outer layers to be pulled inward by the increasingly powerful gravitational force. In response, the core’s temperature increases, causing the outer layers to expand in order to maintain stability.
Eventually, the Sun will enter a new phase of its life—becoming a Red Giant—causing the oceans to evaporate, incinerating humanity, and ultimately engulfing the Earth.
3. Bye Bye Hydrogen
As the universe ages and reaches its twilight years, the cosmic scenery will drastically change. Like our Sun, most stars in the universe are gradually consuming their fuel and will eventually collapse into nothing but carbon.
Larger stars eventually become supernovas, or may even transform into neutron stars or black holes. However, even these cosmic phenomena will ultimately dissipate or reform into smaller stars that meet the same end.
Once all the free hydrogen is consumed, there will be no remaining fuel to generate new stars, plunging the universe into complete darkness. It will also reach temperatures of -273 degrees Celsius (-459 °F), also known as absolute zero. Under such conditions, no form of life could survive. Fortunately, by then, we will have long been gone for billions of years.
2. ‘Shooting Stars’
The term “shooting star” is commonly used to describe the bright trail of gas left behind by meteors as they disintegrate in the atmosphere. But real shooting stars do exist. Yes, burning spheres of gas that travel freely across the universe are indeed real.
This happens when a star’s velocity is so extreme that it escapes its galaxy and embarks on a journey through the universe at speeds of tens of thousands of kilometers per second.
These massive nuclear-powered stars tear through everything in their path, wreaking havoc on the delicate balance of the planetary orbits they pass by. Fortunately for Earth, only about a dozen of these hypervelocity stars have been detected so far.
The likelihood of us actually crossing paths with one of these stars in our immense universe is minuscule. Still, that won’t prevent one from potentially obliterating us if it ever decides to pass through our solar system.
1. Losing The Moon
The Moon is gradually moving away from Earth at a rate of 3.8 centimeters (1.5 in) per year. While it’s impossible for it to completely escape, it raises an interesting question: What if our Moon simply vanished?
Imagine this: A massive, Earth-shattering asteroid is heading our way, but it strikes the Moon instead. What would happen then?
Due to its dominant gravitational influence, the Moon’s dust would eventually clump together and form rings around the Earth, similar to Saturn’s. Meteorites would continuously break off these rings and collide with Earth, wreaking havoc on everything in their path.
Without the Moon’s gravitational pull, the planet’s climate and weather would suffer dramatically. The Moon’s tidal drag slows Earth’s rotation. Without this effect, days would shrink to just 10 hours, and the Earth would tilt by another 60 degrees, throwing our stable seasons into chaos.
