Buzz
The Milky Way, our galaxy, is the first step into the vast expanse of space. While the multitude of stars and planets might seem like an overused trope, every new discovery by scientists continues to add layers of wonder to this cosmic system.
Within the Milky Way, we find dark matter storms, unusual signals, and phenomena never seen before. These exciting discoveries not only provide answers to lingering questions but also reveal a galaxy with a fierce history. The Milky Way has clashed with other galaxies, annihilated some, and now resides next to a cosmic adversary that will one day bring about its end.
10. The Violent Demise of Apep
In 2018, astronomers made a groundbreaking discovery in our galaxy. Hidden within the Milky Way lies a binary star system, where two stars orbit each other. These stars are Wolf-Rayet stars, supermassive dying suns.
This particular system is labeled 2XMM J160050.7–514245, though it has earned the intriguing nickname Apep, named after the Egyptian snake god associated with chaos. The uniqueness of the system lies in the dramatic consequences that will follow its eventual demise.
When Wolf-Rayet stars reach the end of their lives and collapse, they unleash massive supernovas and powerful gamma-ray bursts. These gamma-ray bursts are among the most energetic and luminous phenomena that the universe can produce—and this will be the first time such an event occurs in the Milky Way.
Although gamma-ray bursts are rare, Apep stands as a strong contender. Right now, the two stars in this binary system are orbiting each other at an incredible speed, sending out brilliant streams of matter in a mesmerizing pinwheel pattern.
The exact cause of this rapid spinning is still unknown, but it’s one of the reasons why Apep might eventually collapse into a gamma-ray burst. Only Wolf-Rayet systems with sufficient velocity, among other factors, are capable of producing such a dramatic gamma event.
9. The Goblin
One of the most intriguing mysteries pursued by astronomers is the elusive Planet 9. This giant planet is believed to be lurking somewhere beyond the solar system, though it remains largely theoretical. Despite this, there are signs suggesting its existence.
In 2018, scientists discovered a dwarf planet that appeared to be under the influence of a massive gravitational force, much like what would be expected from Planet 9. Found around Halloween, this frozen world earned the nickname 'the Goblin.'
Beyond its eerie name and the potential connection to Planet 9, the dwarf planet itself is extraordinary. Its orbit around the Sun is unlike any other, resembling a stretched rubber band, and it takes a staggering 40,000 years to complete one full revolution.
Because it resides on the outskirts of the solar system, the Goblin is visible for only about 1% of its orbit. This discovery holds significant value as it enriches our understanding of the outer reaches of the solar system, a region that is still largely a mystery.
The Goblin joins two other minor planets in this distant part of space. Together, these three objects seem to be influenced by the gravitational pull of a massive, unidentified body—likely the elusive Planet 9.
8. Dark Matter Hurricane
In 2017, scientists detected an unusual phenomenon heading towards Earth. But this time, it wasn’t an asteroid. Instead, it was a ribbon of stars speeding through the region of the Milky Way that includes our solar system.
Known as the 'S1 stream,' this phenomenon is the remnant of a dwarf galaxy that was shattered by the Milky Way. While there’s no threat of this rogue stream bombarding us, physicists believe that it may carry a significant amount of dark matter, the substance that once held the dwarf galaxy together.
Though it bears the ominous name of a 'dark matter hurricane,' this event brings promising news. So far, technology has failed to detect dark matter because its nature remains a mystery, and we don’t yet know what to search for.
Dark matter is real, but it remains invisible and its makeup is still unknown. However, when the Earth intersects with the hurricane, there’s a possibility that local dark matter could surge. This shift could offer the first physical evidence of dark matter, providing a definitive proof of its existence.
7. The Mysterious Signal
Astronomers have been detecting a peculiar signal for quite some time. Two clues point to dark matter as the source. The signal emanates from the center of the Milky Way, where the so-called galactic bulge resides—essentially a hotspot for gamma rays.
The bulge contains a vast concentration of gamma rays, and most research supports the idea that dark matter is behind the signal. Additionally, the smoothness of the signal aligns with what scientists expect from dark matter.
However, in 2018, a new study proposed that the bulge and the signal might not be connected to dark matter at all. Instead, they could be caused by stars. This conclusion was drawn after analyzing data from a telescope that spent a decade in orbit around Earth, revealing that the gamma-ray signals mirrored the location of ancient stars at the galaxy's core.
These stars, known as millisecond pulsars, are as old as 10 billion years. Their great distance from Earth may explain the false 'dark matter' signal. As their signals travel from such a vast distance, they might have blended together, creating the smooth, uniform distribution that resembles dark matter emissions.
6. Toxic Space Grease
Space might seem like an empty void, but it's actually filled with electromagnetic radiation, soot, and dust. In 2018, researchers conducted a study to estimate the quantity of another unusual substance—space grease.
This gooey substance is known as aliphatic carbon, a greasy form of hydrogen-bound carbon. It’s just one of the many things that stars release into space. To measure its abundance, scientists created synthetic space grease, compared its properties to real samples, and the results were surprising.
The Milky Way is teeming with up to three times more space grease than previously believed—around 11 billion trillion trillion tons. While this sticky substance might be dirty and likely toxic, it is a fascinating subject of scientific study.
Carbon is a key element for life, and this particular form is abundant in space. One day, it may help explain how life-bearing solar systems, including our own, come to be in the Milky Way.
The abundance of this organic matter in space remains a mystery, though there is no real threat of things becoming overly sticky. Solar winds seem to keep the grease from accumulating and clogging up the galaxy.
5. The Planet-Star Object
Located about 20 light-years from Earth, there is a peculiar object. Initially thought to be a brown dwarf when it was discovered in 2016, brown dwarfs are often called 'failed stars' as they are larger than planets but too small to ignite hydrogen and become stars.
However, a more recent study has shown that this object is far more complex and defies simple classification. Known as SIMP J01365663+0933473, it is a rogue body with no solar system of its own. At just 200 million years old, it’s also too young to be a brown dwarf.
Remarkably, the object lies somewhere between a failed star and a planet. With 12 times the mass of Jupiter, this massive entity also outshines Jupiter in another remarkable way. Scientists were astonished to discover that the magnetic field of SIMP J01365663+0933473 was 200 times stronger than Jupiter’s.
The incredible strength of the magnetic field is as baffling as the stunning auroras within it. Researchers are hopeful that this anomaly could provide insights into the magnetic characteristics of both stars and planets.
4. An Ancient Wound
While studying a detailed map of the galaxy, scientists noticed something peculiar. A cluster of stars exhibited unusual behavior. Although they orbited with the rest of the stars in the galactic disk, these rogue suns also spiraled around one another. On a larger scale, the formation appeared to resemble the spiral of a snail’s shell.
In 2018, scientists achieved a remarkable feat by reversing time. They utilized data from six million stars, including their positions and velocities, to unravel the spiral. Their models revealed that the unusual shape was actually a scar. Around 300 to 900 million years ago, a massive gravitational disturbance struck the Milky Way and displaced a portion of it.
The prime suspect for this cosmic injury was the nearby Sagittarius dwarf galaxy. Previous studies indicated that the Sagittarius disk likely grazed the Milky Way around 200 million to a billion years ago, aligning perfectly with the findings. Ironically, while the Milky Way is currently siphoning stars from Sagittarius, in 100 million years, it will destroy the very galaxy that caused its wound.
3. Strange Split
Recently, scientists from various nations focused their radio telescopes on the same object—the black hole at the heart of our galaxy. Their goal was to capture the most detailed image yet of Sagittarius A.
Radio telescopes occasionally capture images of lines known as nonthermal radio filaments. These mysterious structures are invisible to the naked eye, and their nature remains a mystery. One of these filaments appeared in a photograph of Sagittarius. Stretching over 2.3 light-years, it seemed to slither toward the black hole. The high-resolution imaging confirmed that the filament originated from its current location.
Beyond that, explanations are scarce. One hypothesis suggests that the fusion of magnetic fields could generate ribbons of highly energized particles. It's thought that Sagittarius A might be spinning these streams from a magnetic field created by its interaction with surrounding gas clouds.
The filament could also be a tear in space itself. Referred to as topological defects, these form when the ever-expanding vacuum of space causes a rift. These defects are believed to carry electrical currents and mass similar to the filaments, with the galactic center being a prime environment for their formation. This is exactly where all the Milky Way's filaments have been found.
2. A Lost Sibling
Our galaxy cluster is home to two giants: the Milky Way and Andromeda, along with several smaller dwarf galaxies. One of these tiny galaxies is M32, which orbits Andromeda. Its unusual nature left scientists puzzled, as it appeared to be mostly core, lacking ancient stars and looking highly compact.
In 2018, astronomers were astonished to discover a third massive galaxy that once occupied the same space. Research on Andromeda’s stellar halo, previously believed to be remnants of smaller galaxies consumed by Andromeda, revealed that much of the halo actually belongs to a galaxy that Andromeda had torn apart, even though it was nearly as large.
The galaxy responsible for the halo’s stars is thought to be M32. About two billion years ago, Andromeda likely consumed everything but M32's core. This explains the peculiar appearance of M32.
This discovery serves as a sobering warning for the Milky Way’s future. Our galaxy is on a collision course with Andromeda. Since Andromeda is twice as massive, the Milky Way will meet the same fate as M32. Fortunately, the Milky Way’s end is still about four billion years away.
1. A Dead Galaxy
This might sound strange, but within our galaxy lies the remains of another. In 2018, scientists studied the movements of stars in the Milky Way. After taking around two million measurements, they discovered that about 33,000 stars were foreign, having been born in a different galaxy.
Stars' movements reflect their origins, and this group of stars within the Milky Way moved in a way that set them apart. Researchers analyzed the chemical makeup of 600 of these stars and used the results to estimate the size and age of their home galaxy. This galaxy, now known as Gaia-Enceladus, was confirmed to be a dead galaxy.
Around 10 billion years ago, Gaia-Enceladus was about one-fifth the size of our galaxy. While the Milky Way had absorbed dwarf galaxies before, Gaia-Enceladus was large enough to be considered a major galaxy, leading to a massive collision that ultimately destroyed it.
This cataclysmic event, which filled the inner regions of the Milky Way with new stars, may help explain why our galaxy's disk is so thick. One thing is certain: had the crash never occurred, the Milky Way would look quite different today.
