cosmology

Presently the cosmic CMB temperature is 2.725 K. It evolves as $T(t)$ proportional to $1/a(t)$ or $(1+z)$. In one year and in 100 years from now, how much would this temperature have dropped? How to ...

Sponsored by Perplexity! This is truly a game-changer – Perplexity Computer built this insane tool in only one prompt! Check out my tool and build your own today: https://pplx.ai/cool-worlds-youtube-1 Today’s video explores the most terrifying calculation I’ve ever done, one that comes with some deeply unsettling implications for the Universe in which we live… Written […]

Meet Dr. Esra Bulbul: 2025 HEAD Mid-Career Prize winner, X-ray cosmologist, and the scientist mapping galaxy clusters to uncover the nature of dark energy.

The hunt for Planet Nine continues as new discoveries make the Solar System’s biggest mystery even harder to solve. Is there a massive undiscovered planet on the outer reaches of the Solar System? The idea has been around since before the discovery of Pluto in the 1930s. Labeled as planet X, prominent astronomers had put [...]

Every galaxy you’ve ever seen in a photograph is hiding something. Beyond the glowing disc of stars and gas that the camera captures lies a vast, ghostly outer region called a halo, too faint to see easily but packed with clues about how that galaxy came to be. ESA has just formally committed to a […]

Astronomers have discovered a powerful “galaxy-killing wind” in the early universe that may help solve one of the biggest mysteries in modern astronomy: why so many massive galaxies stopped forming stars much earlier than scientists expected. The discovery suggests that some young galaxies grew rapidly and then died just as quickly, not because of exotic […] The post Cosmic “galaxy-killing wind” …

What if some black holes aren’t black holes at all? A new theoretical study suggests that when a massive star collapses, it might not form a singularity hidden behind an event horizon. Instead, the collapse could trigger the birth of a tiny new universe inside the dying star. Driven by dark energy, this miniature cosmos would expand and push back against gravity, preventing complete collapse and …

Hi everyone Einstein mathematical theory suggests that wormhole are found inside a blackhole in a quantum foam and more therefore the universe doesn't have an edge because to create a wormhole you would need to fold something and to fold something you would need edges and if einstein's math is... Read more

A bold claim that the universe’s accelerating expansion was an illusion has been put to the test—and failed. Researchers found that the study behind the controversy made key mistakes when analyzing supernova data. After revisiting the evidence, astronomers concluded that cosmic acceleration remains as strong as ever.

GW231123 defies our best models of stellar collapse, hosting two black holes that shouldn't exist. A new paper proposes a radical solution: these monsters may have been born in the early universe as primordial black holes, quietly feeding for billions of years until they became the record-breakers we detected today.

Here’s one of the most unsettling facts in all of science. The universe is not just expanding, it’s expanding faster and faster. Every galaxy is moving away from every other galaxy, and the further away it is, the faster it goes and worse still, that acceleration is speeding up. Whatever is driving it, and we […] The post The Universe is Still Running Away From Us appeared first on Knowridge Scie…

A newly detected black hole may not be what it seems. Scientists say its unusual characteristics make it one of the most intriguing cosmic signals seen in recent years.

A bold claim that the universe’s accelerating expansion was an illusion has been put to the test—and failed. Researchers found that the study behind the controversy made key mistakes when analyzing supernova data. After revisiting the evidence, astronomers concluded that cosmic acceleration remains as strong as ever.

Astronomers using NASA’s powerful James Webb Space Telescope may have solved one of the biggest mysteries of the early universe. A strange object known as a “little red dot” appears to be a rapidly growing supermassive black hole hidden inside a thick cloud of gas. Little red dots were first discovered by the James Webb […] The post Mysterious “little red dot” may be a giant black hole wrapped in…

The quasar existed 12.9 billion years ago and shows that supermassive black holes were able to age rapidly in the early universe.

A rare meteorite recovered from the Sahara Desert has revealed compelling evidence for a long-lost world that existed during the solar system’s earliest days. About 4.5 billion years ago, a large planetary body, potentially as large as the Moon or even Mars, orbited the Sun before colliding with another object and breaking apart. Now, researchers [...]

For a few uneasy months, the universe seemed to be slowing down. Late in 2025, a team of astronomers announced that the cosmic acceleration discovered nearly three decades earlier, the finding that won a Nobel Prize and rewrote the story of everything, might have been an illusion all along. The culprit, they argued, was hiding in the explodin New! Sign up for our email newsletter on Substack.

Last year, a study sent a quiet tremor through the field of cosmology. A team of researchers claimed that the universe's expansion might be slowing down, not speeding up, suggesting that dark energy, the mysterious force thought to be driving the cosmos apart, could be weakening. If true, it would have shaken the foundations of our understanding of the universe. Now, a new study including two Nob…

We think of our accounts of the universe and cosmology as well-founded and value-free. The Big Bang theory is surely one of those. But critics argue this is not the case. It was first put forward by a Catholic priest and physicist, Georges Lemaître, who initially called it the ‘hypothesis of the primeval atom’ — […]

A new study shows that the Small Magellanic Cloud is being pulled apart by its larger sibling on the Milky Way's periphery, upending our understanding of our cosmic neighbor.