A new cosmic census estimates that 40 quintillion stellar black holes exist throughout the universe, with many forming within dense star clusters. Astronomers have unveiled a staggering new census of the cosmos, estimating that approximately 40...

Astronomers spot UV radiation from galaxy MXDFz4.4, just 1.4 billion years after the Big Bang, reshaping ideas about the early universe. Astronomers have captured the first clear signature of ionizing radiation leaking from a galaxy that lived at the...

Scientists have achieved the most precise measurement of primordial helium to date, providing a clearer window into the universe’s earliest moments. An international team of researchers has achieved a milestone in observational cosmology, pinning down...

energy reserves, complex circumburst environments, and evolving shock microphysics jointly shape the fleeting glows of the universe’s most violent explosions. The study was posted to the arXiv preprint server on October 23, 2026.

invisible boundary known as the event horizon. For decades, astronomers have assumed that when two black holes collide, the universe offers no visual spectacle. The event unfolds silently, detectable only through ripples in spacetime. Then, in November...

radiation from escaping the galaxy. (CREDIT: Wikimedia / CC BY-SA 4.0) Rethinking the Drivers of Reionization During the universe’s first billion years, the cosmos transitioned from a state filled with neutral hydrogen to one of ionized gas—a process...

with the Chandra X-ray Observatory further amplified this impact, demonstrating that the most accurate maps of the universe are often those built by combining multiple sources of data. While the physical presence of the Swift observatory may soon vanish...

challenging current scientific models regarding the nature of dark energy. Nearly thirty years after the discovery that the universe’s expansion is accelerating, astronomers are revisiting the fundamental nature of the force behind this phenomenon. New...

Hundreds of newly predicted manganese signals offer a breakthrough in tracing cosmic chemistry and understanding how the universe forged its elements. Astronomers have unveiled a new diagnostic tool for mapping the chemical history of the cosmos,...

wave observatories are poised to peer into the deepest recesses of time, potentially uncovering the remnants of the universe’s very first stars. A new study, recently shared on the arXiv preprint server, suggests that these future facilities could...

work, Shapiro is now tackling the Hubble tension, a major discrepancy in current measurements of the expansion rate of the universe. Alongside his work with the research group led by Alex Filippenko at UC Berkeley, Shapiro is continuing his exploration...

NASA’s Juno mission has discovered that Jupiter utilizes a complex system of plasma waves to shield itself from the intense pressure of solar wind. Data transmitted by NASA’s Juno spacecraft has revealed that Jupiter employs a sophisticated,...

that our fundamental understanding of solar physics can be extended to explain the most extreme energy-release events in the universe. Comparisons of X-ray brightness across different energy bands reveal distinct patterns in soft and hard X-ray...

have found five rare, carbon-rich ancient stars in a nearby galaxy, showing that the earliest chemical history of the universe was not limited to the Milky Way. Some stars are more than points of light in the sky. They are time capsules. Formed billions...

of these transitions, providing a tighter constraint on models that link particle physics to the early evolution of the universe. Pairwise distance between 10,000 events in each category of signal (BH with mixture mass points) and background (QCD...

Aquarius IV as an ultra-faint dwarf galaxy (UFDG). These systems are among the most sparse stellar structures in the universe, containing only a fraction of the stars found in typical galaxies. While the Milky Way boasts hundreds of billions of stars,...

forged from the wreckage and merger of thousands of smaller, distinct galactic systems that existed during the dawn of the universe. Simulating the Milky Way’s Turbulent Ancestry Led by University of Chicago astronomer Harley Katz, the research team...

A record-breaking blazar observation has shed new light on ancient black hole activity and the universe’s mysterious hidden radiation field. Astronomers have achieved a landmark breakthrough in high-energy astrophysics, detecting the most distant...

hypotheses. One of the most popular theories is the Fermi Paradox, which questions why, despite the vastness of the universe and the high probability of habitable planets, we have yet to encounter any signs of extraterrestrial civilizations. Other...

of Portsmouth investigates the impact of pair-instability supernovae, which are among the most cataclysmic events in the universe. Unlike conventional stellar deaths, these massive explosions completely obliterate the progenitor star, ejecting vast...