NASA’s James Webb Space Telescope has produced the deepest and sharpest infrared image of the distant universe to date. Known as Webb’s First Deep Field, this image of galaxy cluster SMACS 0723 is overflowing with detail.

Something is wrong with Einstein’s theory of gravity

Everything in the universe has gravity – and feels it too. Yet this most common fundamental force is also the one that poses the greatest challenges to physicists. Albert Einstein’s theory of general relativity (opens in a new tab) was remarkably successful in describing the gravity of stars and planets, but it doesn’t seem to apply perfectly to all scales.

General relativity has passed many years of observational tests, from Eddington’s measurement (opens in a new tab) from the deflection of starlight by the Sun in 1919 to the recent detection of gravitational waves (opens in a new tab). However, gaps in our understanding begin to appear when we try to apply it to extremely small distances, where the laws of quantum mechanics operate. (opens in a new tab)or when we try to describe the whole universe.

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