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South Korean Study Questions Universe's Expanding Acceleration

11/18/2025

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Summary

Story summary

South Korean astronomers report the universe's expansion may be slowing, challenging the view that it is accelerating due to dark energy.
They show a correlation between Type Ia supernova brightness and host galaxy age, suggesting previous distance measurements may be flawed.
Adam Riess, an astrophysicist, has raised concerns about the study's methodology and assumptions, and the Vera C. Rubin Observatory could offer clearer insights.

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Story summary

South Korean astronomers report the universe's expansion may be slowing, challenging the view that it is accelerating due to dark energy.
They show a correlation between Type Ia supernova brightness and host galaxy age, suggesting previous distance measurements may be flawed.
Adam Riess, an astrophysicist, has raised concerns about the study's methodology and assumptions, and the Vera C. Rubin Observatory could offer clearer insights.