LONDON — For a brief moment, scientists thought everything they knew about space was wrong.
In late 2025, a team of space researchers claimed that the universe was slowing down. This shocked the scientific world. For nearly 30 years, scientists believed the universe was growing faster and faster every day.
Now, in June 2026, a new study by top global experts has settled the debate. Their answer? The universe is still speeding up. The previous alarm was just a mistake “in the math.”
To understand the debate, we must look at how scientists measure space. They use exploding stars called Type Ia supernovae.
Think of these exploding stars like identical 100-watt light bulbs scattered across the dark night. Because every bulb has the same brightness, you can easily guess how far away it is. A dim light is far away, and a bright light is close.
By looking at these space "light bulbs," scientists discovered in 1998 that the universe is stretching out faster and faster. They blamed this on a mysterious force called dark energy.
In November 2025, a research team led by Young-Wook Lee in South Korea said these light bulbs were tricking us.
They claimed that older galaxies change the brightness of the exploding stars. They argued that because the stars look different over time, dark energy might not be real. If true, the universe would eventually stop growing and collapse into a giant crash.
This month, a team of international experts—including Nobel Prize winners Adam Riess and Brian Schmidt—checked the South Korean team’s work.
They found major errors. The 2025 team wrongly assumed that the age of a single star was the same as the age of the whole galaxy around it. They also skipped standard steps used to clean up space data.
When the experts fixed these errors and checked thousands of exploding stars, the problem disappeared. The universe is not slowing down. Dark energy is still real, and the universe will keep expanding forever.
Scientists say this debate shows that science works well. Experts always double-check big claims to find the truth.
Soon, massive new tools like the Vera C. Rubin Observatory will take pictures of thousands more exploding stars. These new photos will help scientists understand the mysteries of our growing universe better than ever before.
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