In physics, spacetime is a mathematical model that combines the three dimensions of space and one dimension of time into a single four-dimensional manifold. Spacetime diagrams can be used to visualize relativistic effects, such as why different observers perceive differently where and when events occur. Until the 20th century, it was assumed that the three-dimensional geometry of the universe was independent of one-dimensional time. The physicist Albert Einstein helped develop the idea of spacetime as part of his theory of relativity. Prior to his pioneering work, scientists had two separate theories to explain physical phenomena: Isaac Newton's laws of physics described the motion of massive objects, while James Clerk Maxwell's electromagnetic models explained the properties of light.

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The Big Bang should have made cracks in spacetime—why haven’t we found them?

Webb Telescope Uses Ripple In Spacetime To Image ‘Earendel,’ The Most Distant Star Ever Seen 28 Billion Light-Years Distant

The Hubble Space Telescope captures a gravitationally lensed galaxy. Gravitational lensing occurs when a very massive celestial body causes a sufficient curvature of spacetime

The Hunt for the Gravitational Wave Background: NASA’s FERMI Searches for Ripples in Spacetime

How is spacetime altered by entangled particles?

Wormholes – Shortcuts Connecting Two Points in Spacetime – Help Resolve Black Hole Information Paradox