Buzz
Space is incredibly fascinating, with its strange and unpredictable nature. Planets revolve around stars that live, die, and regenerate, while galaxies themselves circle around massive black holes that slowly drag everything toward their inevitable end. Occasionally, though, space presents us with something so peculiar that it’s nearly impossible to understand.
10. The Red Square Nebula
Most things in space tend to be spherical. Planets, stars, galaxies, and orbits all generally take on a circular shape. But then there’s the Red Square Nebula, a gas cloud that defies this norm by taking the shape of a square. Naturally, this baffled astronomers, as squares are not something you expect to find in space.
However, it’s not exactly a square either. Upon closer inspection of the image, you'll notice that the shape is actually made up of two cones with their tips meeting. While there aren't many cones floating around in space, this hourglass-shaped nebula is lit up brightly by a star positioned right at the center—where the cones meet. It’s possible that this star could eventually explode in a supernova, causing the rings at the cone's base to glow with extraordinary brilliance.
9. The Pillars Of Creation
As Douglas Adams famously wrote, “Space is big. Really big. You just won’t believe how vastly hugely mind-bogglingly big it is.” The light year is the unit of measurement for distances in space, but have you ever stopped to consider what that actually means? A light year is so immense that it takes light—a thing that moves faster than anything else in the universe—an entire year to travel that distance.
This means that when we observe distant objects in space, like the Pillars of Creation (a formation within the Eagle Nebula), we are essentially looking back in time. How can this be? Well, it takes light 7,000 years to travel from the Eagle Nebula to Earth, and we see things through the light that reflects off them. So, the light that we see from the Eagle Nebula is already 7,000 years old by the time it reaches us.
This glimpse into the past can lead to some strange conclusions. For example, astronomers believe the Pillars of Creation were destroyed by a supernova around 6,000 years ago. Yet, because light travels so slowly, we can still see the pillars if we look up at the night sky, even though they no longer exist.
8. Galaxy Collisions
In space, everything is constantly in motion—objects orbiting, spinning, and racing through the vast emptiness. Due to this movement and the immense gravitational forces between them, galaxies often collide with each other. This might not be all that surprising—just look at the moon to understand how space pulls objects together. When two galaxies, each containing billions of stars, collide, chaos inevitably follows.
In galactic collisions, the chance of two stars actually colliding is practically zero. How is that possible? Aside from being vast, space is also mostly empty. After all, it's called 'space' for a reason. While galaxies may appear solid from afar, remember that we’re currently in a galaxy, and the closest star to us is 4.2 light years away. That’s an immense amount of space.
7. The Horizon Problem
Space is a massive enigma wherever you look. For instance, if we observe the background radiation at a point in the east of our sky and then measure it again at a point in the west, separated by about 28 billion light years, we will find that the background radiation at both points has the exact same temperature!
This seems impossible because nothing can move faster than light, and light hasn’t even had enough time to travel between those two points. So how has the background temperature managed to stabilize to such a uniform level, and even more astonishingly, how is it exactly the same?
This phenomenon is explained by the theory of inflation, which proposes that the universe expanded rapidly across vast distances just moments after the big bang. According to this theory, more universe wasn’t created as the boundaries stretched outward, but instead, the existing space-time was stretched like taffy in the blink of an eye. In that incredibly brief moment, a space as small as a nanometer could have expanded to several light years. This doesn’t violate the law that nothing can exceed the speed of light, because nothing actually traveled—it simply inflated.
In the simplest possible terms, think of the early universe as a single pixel in an image-editing program. Now, imagine expanding the image by a factor of 10 billion. Since the entire pixel is still made of the same material, its properties—such as temperature—remain uniform.
6. How A Black Hole Kills You
Black holes are so incredibly dense that strange things happen near them. It's easy to picture being pulled into one and spending eternity (or using up your oxygen) screaming into an endless void of darkness. But don’t worry—the black hole’s overwhelming gravity will take care of that for you.
The gravitational pull becomes stronger as you approach the source, and when that force is incredibly intense, the difference can vary drastically over even a small distance—say, the height of a person. If you fell feet-first into a black hole, the gravity on your feet would eventually be so much stronger than the gravity on your head that it would stretch your body out into a long, spaghetti-like strand of atoms before ultimately crushing you at the center. You might want to reconsider any plans to dive into the nearest black hole.
5. Brain Cells And The Universe
Recently, physicists simulated the origins of the universe, recreating the big bang and the chain of events that led to the cosmos we observe today. At the heart of this simulation lies a vibrant yellow cluster of tightly packed galaxies, surrounded by a ‘web’ of less dense galaxies, stars, dark matter, and everything else.
Meanwhile, a researcher at Brandeis University was studying how brain neurons are interconnected, using a microscope to examine thin slices of a mouse's brain. The resulting image depicted a yellow neuron surrounded by a red ‘web’ of connections. Sound familiar?
The two images, although dramatically different in scale (one in nanometers, the other in light years), look eerily similar. Could this be just a case of nature repeating patterns, or are we about to discover that the universe is really just a giant brain cell floating in an even more enormous universe?
4. Missing Baryons
According to the big bang theory, the universe will eventually slow its expansion due to the gravitational pull of all the matter within it. However, baryonic matter (the visible stuff like stars, planets, galaxies, and nebulas) only makes up about 1–10 percent of the necessary matter for this to occur. Theorists have balanced this equation by suggesting that 'dark matter' (matter we can't observe) must account for the remaining portion.
Despite various theories attempting to explain the missing baryons, none have been successful. The most commonly proposed idea is that the missing matter exists in the intergalactic medium—the sparse gases and atoms floating between galaxies. Yet, when we account for those, we still come up way short. One explanation suggests that a significant portion of the gases in the intergalactic medium may be ionized, meaning they wouldn't absorb light. However, no theory has provided enough ionization to make up the difference. For now, we remain clueless as to where a large chunk of this missing matter might be.
3. The Eridanus Black Hole
The Hubble Deep Space Field is an image taken by the Hubble telescope aimed at seemingly 'empty' space, yet it reveals thousands of far-off galaxies. However, when we focus on a seemingly 'empty' area of the Eridanus constellation, we encounter nothing. It's simply a vast, black void stretching over a billion light years. While most other empty regions in the night sky showcase galaxies in a similar distribution, this particular void is unusual. Despite using several techniques to detect dark matter, even these methods have failed when probing the Eridanus void.
One intriguing theory posits that this void contains a supermassive black hole, around which nearby galactic clusters orbit. The rapid movement of these clusters could explain the 'illusion' of an expanding universe. A competing theory proposes that matter naturally aggregates, forming galactic clusters, and the resulting drift gradually creates voids between these clusters over time.
However, this doesn't clarify the existence of a second void astronomers discovered in the southern night sky, which is an astounding billion light years wide. Such a vast expanse challenges the big bang theory, as the universe hasn't existed long enough for such an enormous void to emerge through regular galactic drift. Maybe there’s more truth to the supermassive black hole theory than we initially thought.
2. The Solar Corona Problem
Typically, the farther an object is from a heat source, the colder it becomes. So, it’s quite puzzling that the Sun’s surface is about 2,760 degrees Celsius (5,000 °F), yet its corona, which is like its outer atmosphere, is over 200 times hotter in some areas.
Although certain processes within stars might explain temperature differences, none account for such a dramatic temperature gap. While the exact reason is still unclear, scientists believe it could be related to magnetic field patches that appear, disappear, and shift on the Sun’s surface. These magnetic fields can’t cross over one another, causing them to rearrange whenever they get close, a process that potentially continues to heat the corona.
While this sounds like a reasonable explanation, it’s far from simple. Experts can’t even agree on how long these magnetic patches last, nor on how exactly they contribute to heating the corona. Even if this theory is correct, no one knows why these magnetic anomalies emerge in the first place.
1. Cool Stars
When we think of stars, 'hot' is usually at the top of the list. If you were to visit a typical star, the risk of being burned to a crisp would be far greater than freezing. But brown dwarfs are an exception—these stars are much cooler by stellar standards. Recently, astronomers discovered a new class within the brown dwarf family, called Y dwarfs, which are the coldest stars of all. Y dwarfs are colder than the human body. At just 27 degrees Celsius (80 °F), you could theoretically touch one, though the immense gravity would crush you instantly into a fine paste.
These stars are incredibly hard to detect because they emit almost no visible light, so we have to look for them in the infrared spectrum. Some scientists even speculate that brown dwarfs and Y dwarfs could be the elusive “dark matter” that’s missing from the universe.
