Dark energy remains a mystery as Einstein's theory of gravity passes another test

The researchers examined 100 million galaxies for evidence that gravity strength has varied throughout the universe's history.

Variation may also shed light on what dark energy is, other than the name given by scientists.

The European Space Agency's Euclid mission and NASA's Nancy Grace Roman Space Telescope are also looking for changes in gravity strength across space and time.

Scientists believe that after the initial push of the Big Bang, the universe's expansion should slow.

Dark energy, in effect, works against gravity, pushing cosmic objects apart as gravity pulls them together.

It's not just observations of galaxies that could point to changes in gravity strength.

Objects like galaxies warp spacetime so strongly that light's path is curved as it passes through one. When this light arrives on Earth,

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