Buzz
Discoveries that align with cosmological theories often feel like a gratifying confirmation. However, the ones that defy existing standards spark our imagination the most, hinting at a more enigmatic, evolving, and perhaps even more daunting universe.
At times, we become overly confident in our scientific understanding. These new discoveries remind us of how much we still don't know and how many of our previous theories about the vast unknown will need to be revisited.
10. A Supernova Gave Birth to Our Solar System
Every cosmic disaster marks the beginning of something new. A supernova, for instance, could ignite the birth of a solar system – like ours.
Our solar system originated from a cloud of debris, which eventually came together to form the planets and scattered rocks we now call home. But this transformation needed a spark.
That spark? A supernova. The proof lies in the isotopes found in ancient meteorites. One such isotope is iron-60, which decays into nickel-60 and is created by specific stars and supernovae. These meteorites contained this distinctive nickel-60, indicating that a supernova shockwave catalyzed the formation of our solar system. This suggests that supernovae might be continually giving rise to new solar systems throughout the universe.
9. Proxima b is Likely a Scorched, Barren World
Located just 4.2 light-years away, the red dwarf Proxima Centauri is the closest star to us. It also hosts a potentially habitable Earth-like planet, Proxima b, within its zone.
However, Proxima b is likely desolate. In March 2017, astronomers observed Proxima Centauri suddenly flare up 1,000 times brighter in just 10 seconds, pointing to either a violent eruption or the possibility of alien weaponry. Despite its small size, this eruption was 10 times more intense than the Sun's largest eruptions.
At 4.85 billion years old, Proxima b has likely been enduring similar violent outbursts for eons. The star's harsh radiation would have long since stripped away its atmosphere and water, making it unlikely that future relativistic probes will discover any form of life there.
8. Super-Massive Stars Are Surprisingly Common
The universe seems to be far more populated with massive stars (10 or more solar masses) than previously thought.
Astronomers explored the Tarantula Nebula, a stellar nursery 180,000 light-years away, and discovered 30 percent more “extremely, extremely massive stars” than anticipated.
And the largest stars are even bigger than expected. Once thought to cap at 200 solar masses, astronomers are now estimating the limit at 300 solar masses. This suggests a far more violent universe, with 70 percent more supernovae and an 180 percent increase in black hole creation.
7. The Universe Is Brimming With Synestias
Planetary bodies were once categorized into two types: planets and ringed planets. However, this classification has expanded with the discovery of the synestia, a massive cloud of vaporized rock shaped like a red blood cell.
These wispy monsters are born from catastrophic collisions between two rapidly spinning, planet-sized fragments. The angular momentum of each body is preserved, sending their shattered remnants into a swirling cloud of molten debris “with no solid or liquid surface.”
It’s astonishing to consider that a potentially super-common, entirely new type of planetary body exists, yet we’ve never directly observed it. Likely because it doesn’t last long—only about 100 years, which is an incredibly brief time in cosmic terms.
6. Stars Can Be Smaller (And Cooler) Than Planets
We tend to imagine even the weakest stars as being much more substantial than a planet. However, astronomers have just found the tiniest, most adorable star ever, EBLM J0555-57Ab.
Located just 600 light-years away, this star has only about 8 percent of the radius and mass of the Sun. In fact, it’s so small that it's just slightly bigger than Saturn. It wouldn’t even be the largest planet in our solar system, thanks to Jupiter. It’s also colder than some gas giant exoplanets.
EBLM J0555-57Ab is right on the cusp of being a star, just massive enough to fuse hydrogen into helium and avoid the fate of becoming an unremarkable brown dwarf.
5. TRAPPIST-1 Is Too Old For Life
The seven-planet TRAPPIST-1 system, discovered in February 2017, has been a key target in the hunt for alien life, boasting multiple potentially habitable planets. That is, until its age was re-estimated to be 500 million years.
However, new data—including the system’s speed around the galaxy center, the star’s metal content, and chemical absorption lines—indicates that the TRAPPIST system may be as old as our own solar system, possibly even twice as old at 9.8 billion years.
This means it’s unlikely to support life, as it was likely sterilized by flares long ago, serving as a cosmic tragedy and a stark reminder of how rare life might be.
4. Dark Matter Could Be Fading Away
Dark matter has always seemed eternal and ubiquitous, but a new discovery suggests that dark matter might be an unstable force.
Fluctuations observed 300,000 years after the Big Bang didn’t align with the expected speed of the universe’s expansion based on existing models. This anomaly could be explained by decaying dark matter, which existed at the universe's birth but has since transformed into neutrinos or other hypothetical particles.
The analysis suggests that the current universe has 5 percent less dark matter, as some of it decays while the rest remains stable. These unstable elements may have vanished after the first few hundred thousand years, or perhaps they are still decaying, continuously reshaping the future universe.
3. All Sunlike Stars Have Siblings
Many stars, including potentially our own Sun, have companions. A new study reveals that all Sunlike stars are born binary in nature.
Astronomers studied both single and binary stars in the Perseus constellation, 600 light-years away. The calculations make the most sense when considering that all Sunlike stars are born as 'wide binaries,' situated about 500 astronomical units apart (1 AU = 150 million kilometers (93 million miles)).
However, these star pairs either shrink or break apart early in their lifespan, usually within just a million years. A long-lost sibling could provide a better explanation for the current configuration of our solar system.
Although the universe remains largely solitary, the model suggests that 60 percent of these pairs eventually separate. The remaining stars evolve into 'tight binaries.' Meanwhile, our Sun’s hypothetical companion, Nemesis, may be lost among the other stars scattered throughout our galaxy.
2. Dark Energy Is Acting Up
The universe is expanding faster than expected, and the reason remains a mystery. For the past six years, astronomers have been using Hubble to refine measurements of the expansion rate. Their findings indicate that the universe is stretching at a pace of 73 kilometers (45 miles) per second per megaparsec. This means that two galaxies, 3.3 million light-years apart (1 megaparsec), are moving apart at this speed.
This discrepancy—an irreconcilable 9 percent difference from the predictions of the Planck satellite—is highly significant, with only a 1-in-5,000 chance of error.
The study suggests that dark energy may be even more puzzling than previously believed. Perhaps it is growing stronger, or maybe it’s more 'social' than we thought, interacting with the universe in an unexpected way. It’s also possible that a completely new type of particle is responsible.
1. The First Exomoon?
The Kepler spacecraft has detected thousands of exoplanets, but it has yet to find any exomoons, possibly because they are tucked away around planets located farthest from their stars.
The unusual light pattern observed suggests that Kepler-1625 b is a massive Jupiter-like planet with a moon roughly the size of Neptune. We may be on the verge of observing extraterrestrial moons for the first time, which will provide a major boost to the search for habitable worlds. However, further observations with Hubble are required to confirm the finding.
