Gravity used to be the most dependable rule in the cosmic rulebook, the quiet background force that never changed its mind. Now a series of discoveries and bold claims are turning that certainty into ...

Legend has it that Isaac Newton had the moment of inspiration that would lead to his theory of gravity when, on a warm afternoon, he saw an apple fall from a tree and wondered why it should fall down ...

Gravitational waves may leave a permanent timing gap in light, revealing how gravity preserves information through a memory ...

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Emergent gravity is a bold idea. It claims that the force of gravity is a mere illusion, more akin to friction or heat—a property that emerges from some deeper physical interaction. This emergent ...

Keeping an orbiting satellite in the proper attitude is no mean trick. But there are times when antennas and cameras have to be kept pointing continually at the earth if they are to work effectively, ...