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We may have gathered extensive knowledge about space, but the truth is, our understanding remains limited. That’s the beauty of it—all the more exciting as we continually have our minds blown by new findings. Recently, some truly remarkable celestial phenomena have been uncovered.
10. A Man-Made ‘Space Shield’
NASA scientists have discovered an unexpected and beneficial side effect of radio transmissions: a human-created ‘VLF (very low frequency) bubble’ surrounding Earth that offers protection from certain types of radiation.
Earth is home to its natural Van Allen radiation belts, where energetic particles from the Sun become trapped in the Earth’s magnetic field. However, scientists have recently discovered that Earth's own electromagnetic emissions have inadvertently formed a radioactive shield, protecting the planet from some of the high-energy space particles that constantly bombard it.
This protective barrier consists of a mix of electromagnetic debris, including remnants from nuclear tests conducted during the Atomic Age. For over a century, Earth has also been sending out radio waves into space, alongside electric ‘residue’ from the numerous power grids sprawling across the globe.
9. A Double-Ringed Galaxy
The Galaxy PGC 1000714 may very well be the most unique one ever discovered. It is a Hoag-type galaxy with a ring around it, much like Saturn, only on a far grander galactic scale. Less than 0.1% of all galaxies have rings, yet PGC 1000714 stands out with not one, but two rings.
The rings encircle the core, a 5.5-billion-year-old region filled with aging stars that shine red. Surrounding this is a much younger, 0.13-billion-year-old outer ring, glowing with the bright, blue light of youthful stars.
Upon examining the galaxy across various wavelengths, scientists discovered the surprising presence of a second inner ring, located closer to the core. This inner ring is much older and completely separate from the outer ring. Given that most galaxies are elliptical or spiral in shape, PGC 1000714 could remain a singular marvel for quite some time.
8. A Planet Hotter Than Stars
The hottest exoplanet ever discovered is hotter than many stars. Kelt-9b, a recently described planet, reaches a blistering 3,777 degrees Celsius (6,830 °F) on its dark side. On the side facing its star, temperatures soar to around 4,327 degrees Celsius (7,820 °F), nearly as hot as the Sun's surface.
The star in question, Kelt-9, is an A-type star located just 650 light-years away in the constellation Cygnus. A-type stars are among the hottest, and this one is a relatively young 300 million years old. As it ages and expands, its enormous surface will eventually make contact with Kelt-9b.
By that time, the planet may be reduced to nothing more than a charred rock, as the relentless UV radiation from its parent star strips away 10 million tons of material every second, creating a brilliant tail that follows Kelt-9b as it orbits its star in a strange pole-to-pole trajectory.
7. A Silent Supernova
Creating a black hole doesn’t always require a spectacular space-shattering supernova or a collision between two ultra-dense objects like neutron stars. In fact, stars can collapse into black holes with surprising subtlety and a relatively quiet event.
Scientists had speculated it could occur, modeled it on computers, and now believe they've finally witnessed it happening in reality. The Large Binocular Telescope survey identified thousands of potential ‘failed supernovae,’ and one of them seems to be the genuine article.
Star N6946-BH1 possessed just the right mass for this to take place, roughly 25 times the mass of the Sun. The images show it behaving as researchers anticipated—becoming slightly brighter (in comparison to other supernovae) before fading away into the void.
6. The Universe’s Largest Magnetic Fields
Many celestial objects generate magnetic fields, but the largest magnetic fields ever discovered belong to galaxy clusters bound by gravity.
An average galaxy cluster spans around 10 million light-years, while the Milky Way has a comparatively small diameter of just 100,000 light-years. These massive gravitational structures generate magnetic fields that are equally immense in scale.
The clusters resemble a bumper car arena, filled with charged particles, gas clouds, stars, and dark matter, and their turbulent interactions produce a chaotic electromagnetic mixture. When galaxies drift too close and collide, the compressing gases generate arc-like ‘relics’ that can stretch up to six million light-years, potentially surpassing the size of the cluster itself.
5. Galaxies On Fast-Forward
The early universe is filled with mysteries, including a group of unexpectedly massive galaxies that shouldn’t have had enough time to become so large.
These galaxies already contained hundreds of billions of stars (a significant number by today's standards) when the universe was merely 1.5 billion years old. By peering even further back in time and space, astronomers have discovered a new type of hyperactive galaxy that helped fuel the growth of these early giants.
When the universe was still under a billion years old, these precursor galaxies were already churning out stars at an astonishing rate, 100 times faster than the Milky Way. Even in the young, sparsely populated universe, researchers found signs of galaxies merging, forming some of the earliest and most massive specimens.
4. A Mysterious X-Ray Explosion
The Chandra X-ray Observatory spotted something unusual while observing the early universe. Chandra detected an enigmatic X-ray source located 10.7 billion light-years away, which suddenly brightened by 1,000 times before fading back into darkness within just a day.
Astronomers have encountered strange X-ray bursts before, but this one stands out due to its 100,000 times greater luminosity in the X-ray spectrum. Early suspects for this event include massive supernovae, colliding neutron stars, or potentially white dwarfs.
However, the evidence doesn’t support any of these scenarios. The galaxy that hosted the explosion is significantly smaller and farther away than those previously observed, leading astronomers to believe they may have uncovered a “completely new type of cataclysmic event.”
3. An Unexpected Planetary Threesome
Hot Jupiters are a perplexing phenomenon. These massive gas giants, similar in size to Jupiter, orbit unnaturally close to their stars, moving in tight orbits even smaller than that of Mercury.
For the past two decades, scientists have been studying these peculiar planets, discovering nearly 300 of them. Typically, hot Jupiters orbit alone, but in 2015, researchers from the University of Michigan confirmed something that seemed impossible—a hot Jupiter with a companion.
And not just one, but two! The WASP-47 system is home to the hot Jupiter that skimps close to the Sun, along with two vastly different companions: a larger Neptune-like planet and a smaller, much denser, rocky super-Earth.
2. Galactic Dead Zone
Cepheids are relatively young stars, between 10 million and 300 million years old, that pulse with regular changes in brightness, making them excellent cosmic markers for measuring distances.
These stars have been spotted all over the Milky Way. However, astronomers were puzzled about the Cepheids near the galactic core, which is shrouded by thick interstellar dust. By observing in the near-infrared spectrum, they discovered an unexpected ‘desert’ devoid of young stars in this region.
A small number of Cepheids reside near the very center of the galaxy, but just beyond that, a vast, empty void stretches out for 8,000 light-years in every direction. This unusual region is devoid of new stars and has remained quiet for hundreds of millions of years.
1. A Most Precarious Orbit
While we often envision black holes tearing apart anything unlucky enough to come too close, objects can venture dangerously near without disintegrating into chaos.
The newly identified white dwarf X9 holds the record for the closest orbit around a black hole ever observed. X9 is located less than three times the distance from the Moon to Earth from the black hole, completing its orbit in just 28 minutes. This means that a black hole is sending a white dwarf around itself faster than a pizza being delivered.
Located about 15,000 light-years away in the globular star cluster 47 Tucanae, part of the Tucana (toucan) constellation, X9 is thought to have once been a large red star. However, a black hole likely pulled it close, stripping away its outer layers in an ongoing process that could eventually leave behind a diamond-like remnant.
