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A cube refracting different wavelengths of light
An x-cube prism separates visible light into different wavelengths, or colors.
(Image credit: Getty Images)

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Two people hold hands while skydiving over Earth, a view of its surface next to the blue sky is seen.
Why can't we figure out how strong gravity is?

Life's Little Mysteries Despite dozens of experiments over the years, scientists still don't have a precise measurement for gravity's strength. Why is that?

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An abstract illustration of lines and geometric shapes over a starry background
Scientists claim to find 'first observational evidence supporting string theory,' which could finally reveal the nature of dark energy

Physicists have proposed a new model of space-time that may provide the 'first observational evidence supporting string theory,' a new preprint suggests.

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