Standard candles

Hubble Space Telescope image of Supernova 1994D (SN1994D) in the galaxy NGC 4526. Supernova SN 1994D is the bright spot on the lower left. Credit: NASA/ESA.

The universe is still accelerating: New study rejects claim that cosmic expansion has begun to slow down

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An international team, including Nobel laureates Adam Ries and Brian Schmidt, found that the claim that dark energy is weakening was based on an incorrect age estimate of supernovae and the omission of a common correction in the mass
Artist's impression of material spiraling inward, pulled by the strong gravity of a central supermassive black hole, forming an "accretion disk." Credit: Dimitrios Sakkas (tomakti), Antonis Georgakakis, Angel Ruiz, Maria Chira (NOA)

New observations: The relationship between UV and X-ray radiation in quasars has changed over cosmic time

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International research finds that the long-standing correlation between UV and X-ray emissions from quasars is not constant throughout the history of the universe – a hint that the structure of the accretion disk and “corona” around supermassive black holes is not universal
The brightness of RS Puppis, one of the brightest Cepheid variable stars, changes at a constant rate on a six-week cycle. Credit: NASA, ESA, Hubble Heritage Team (STScI/AURA)-Hubble/Europe Collaboration

Pulsating Beacons: Revolutionary Measurements Redefine Cepheid Variable Stars

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**Title:** Pulsating Beacons: Revolutionary Measurements Redefine Cupid Stars **Subtitle:** New study reveals deep insights into the structure and evolution of cupid stars through precise radial measurements, offering new approaches to the study of the universe
Conceptual diagram of this study. Signals from supernovae (close-up lower right), quasars (close-up middle left), and gamma-ray bursts (close-up top center) reach Earth in the Milky Way galaxy (background), where we can use them to measure cosmological parameters. Credit: NAOJ

Rewriting the past and future of the universe - new research sheds light on the fate of our cosmos

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New research has improved the accuracy of the parameters that control the expansion of the universe. More precise parameters will help astronomers determine how the universe grew to its current state, and how it will evolve in the future.
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