All articles tagged with #hubble constant
A rare gravitationally lensed, five-image superluminous supernova called SN Winny (SN 2025wny) offers a direct, one-step method to measure the Hubble constant by timing the delays between the multiple light paths, potentially resolving the universe’s expansion-rate disagreement.
An international team reports the most precise measurement of the Hubble constant to date (about 73.5 km/s/Mpc with ~1% accuracy). While tighter, the result reinforces the long-standing Hubble tension between local measurements and the standard cosmological model, raising the possibility of undiscovered physics or systematic issues and underscoring the need to reassess our understanding of the universe’s expansion.
Space scientists assembled decades of local-universe distance measurements into the Local Distance Network, delivering the most precise direct measure of the Hubble constant to date (73.50 km/s/Mpc with ~1.1% uncertainty) and confirming the ongoing discrepancy between early- and late-universe expansion rates. By anchoring many distance indicators—from parallax stars and megamasers to Cepheids and thousands of galaxies—the study shows the Hubble tension persists, suggesting the standard cosmological model may be incomplete and could point to new physics, with future observatories potentially resolving the difference.
A global team using the cosmic distance ladder reports the universe is expanding at about 73.5 km/s per Mpc, faster than the previous ~67, a discrepancy that challenges current cosmology and could reveal gaps in our understanding of dark energy, gravity, or distance measurements.
A study in Astronomy & Astrophysics presents the most precise combined value for the Hubble constant, about 73.5 km/s/Mpc (≈45.7 miles/s/Mpc), derived from a new distance-network framework that unifies multiple distance indicators. While it clarifies the measurement, the result reinforces the Hubble tension and suggests that cosmology may require new physics or revisions to current models.
Astronomers developed a community-built, open-source distance network that merges local-universe distance measurements to produce a precise Hubble constant of 73.50 ± 0.81 km/s/Mpc. The result confirms, rather than resolves, the existing discrepancy with early-Universe measurements, reinforcing the Hubble tension and hinting at new physics beyond the standard cosmological model. The framework is designed for future testing with next-generation telescopes.
An international effort builds a highly precise local measurement of the Hubble constant (73.50 ± 0.81 km/s/Mpc), reinforcing the discrepancy with early-Universe predictions (~67–68) and strengthening the case that the Hubble tension may point to new physics beyond the standard cosmological model.
Un esfuerzo internacional reporta la medición directa más precisa de la tasa de expansión local: la constante de Hubble es 73.50 ± 0.81 km/s/Mpc (~1%), resultado de la red de distancias locales (H0DN) que combina diversas técnicas y datos de NOIRLab (CTIO y KPNO). Este hallazgo refuerza la tensión con las predicciones del Universo temprano, lo que podría indicar nueva física más allá del modelo cosmológico estándar.
A distant Type I superluminous supernova, SN 2025wny at z=2.01, was gravitationally lensed by a foreground galaxy into four images arriving at different times. By analyzing these time delays and light curves, astronomers aim to refine measurements of the universe's expansion and shed light on dark energy, potentially addressing the Hubble tension.
Physicists propose using the faint, unresolved gravitational-wave background from countless distant black-hole mergers as an independent way to measure the expansion rate of the universe (the Hubble constant), potentially helping resolve the Hubble tension. Even without directly detecting this background, current data already place bounds on H0; upcoming detector upgrades could turn this into a precise measurement, offering a new tool for cosmology while highlighting limitations tied to population models and large uncertainties.
Physicists propose using the faint gravitational-wave background produced by countless distant black-hole mergers as a new, gravity-based method to measure the Hubble constant, offering an independent path to addressing the Hubble tension. Current data already constrain H0 by showing the background’s absence rules out low values; future detector upgrades could turn this into a direct measurement, potentially confirming or challenging existing cosmology without relying on electromagnetic distance ladders or the CMB.
A new method uses the faint gravitational-wave background from unresolved distant black hole mergers—the stochastic siren—to constrain the Hubble constant. By linking merger rates to the observable universe’s size, a stronger background would indicate slower expansion; non-detections thus tighten limits, and when combined with data from individually observed mergers, the approach yields a more precise H0. With future, more sensitive detectors the gravitational-wave background could be detected and used to further refine cosmological measurements, potentially helping resolve the Hubble tension.
Scientists propose using the stochastic gravitational-wave background—the faint, background hum from countless distant mergers—to measure the Hubble constant, offering an independent, multi‑messenger approach that could help resolve the long‑standing Hubble tension as gravitational‑wave detectors grow more sensitive.
Researchers from the University of Illinois and University of Chicago propose the stochastic-siren method, using the gravitational-wave background from countless distant black-hole mergers to infer the Hubble constant. This independent approach can tighten expansion-rate measurements, rule out very slow cosmic expansion with current data, and become more powerful as gravitational-wave detectors improve and the background is detected, potentially helping resolve the Hubble tension.
An international collaboration unified multiple distance-measurement methods into a single statistical framework, achieving a 1% precise measurement of the Hubble constant—the most accurate value to date. While the improved precision narrows uncertainties, it does not resolve the ongoing tension with early-universe predictions, underscoring the need for new physics or modifications to current cosmological models.